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Why You Can’t Return a Kick Serve (Saccadic Blindness)

When you watch professional players return serve, they rarely look rushed, and when a player hits heavy spin at them, they never look bothered. There’s a clip from an exhibition tournament were Federer requests a serve “Right to the forehand, really slow.”

What’s really slow to him?

“Like 113 miles, if you can, please.”

113mph (182 km/h). That’s what Roger Federer considers a “really slow” serve, when it comes right to his forehand.

Now, 113 isn’t slow if it hits a corner, or if it spins into the body (which the serve in the clip actually did), but as far as a pure fastball, 113 is actually slow for a high level returner, and yet most 3.5 adult players would be lucky to even hit the strings on a 113 serve, much less make the return.

Today we’ll draw inspiration from the game of Cricket to break down one of the primary causes of this stark disparity in tennis return ability – vision.

Saccades

A saccade is a rapid eye transition from one fixation to another. Focus on an object near you. Now, switch your focus to a different object. Congratulations – your eyes just performed a saccade.

In fact, your eyes have performed many small saccades while reading this article. Every few seconds as you read, your eyes perform a saccade from the words you are currently reading, to the next few words, and then do so again, and again.

Saccadic eye jumps are the most common method by which the gaze shifts. You perform at least 100,000 saccades every day.

Invisible Blind Spots

You are blind while your eyes perform a saccade. Since the image would be blurred and useless anyway, your brain simply turns off your vision while the saccade occurs.

Wait. What? It doesn’t feel like my vision is blinking in and out all the time.

That’s because your brain fills in the momentary blindness with a projected image. Usually, it’ll just take whatever image your saccade ended on and backfill your memory with that image.

Yes, your brain rewrites history to mask the momentary blindness. (This isn’t the only time on the court your brain will rewrite history.)

For everyday life, this is all well and good – I just looked from my book to my computer screen. I was blind for a few milliseconds during the saccade, but according to my memory, I was already looking at the computer for those few milliseconds, not blind. Does that falsity effect my life? Not at all… typically.

That changes when you’re playing a visually demanding sport.

Terribly Missed Returns

Your brain’s insidious cover-up of this mid-saccade blindness (known as “saccadic masking”) can create a lot of confusion while you’re on the tennis court.

Have you ever been so off on the serve return that you mishit nearly every return, and on most, you weren’t even close? This is most common in novel situations, say, the first set against a lefty, or against a player who hits with heavy kick.

You try to “watch the ball,” and you feel like you’re seeing it, sort of, and yet, somehow, you can never catch it on the strings cleanly.

Your apparent vision on the ball is actually your brain backfilling the blind spot from your saccade.

What’s likely happening here is that your apparent vision on the ball is actually your brain backfilling the blind spot from your saccade. It’s fake. You are not actually seeing the ball bounce, but rather your eyes are trying to catch up with the ball after it bounces. Once your eyes finally get to it, late, your brain lies to your consciousness and displays that you’ve been seeing it the entire time, even though you haven’t. That’s why what you’re “seeing” isn’t assisting you with the swing – you’re not actually seeing the ball; the image you’re perceiving is just a projection created to mask your saccadic blindness.

It’s possible you almost never see the bounce clearly on your return, and you don’t even know it. Many serves are slow, and bounce in an extremely predictable manner. On these serves, even if your vision were regularly obscured by saccadic masking during the bounce, you’d often succeed anyway. When the bounce is sufficiently simple and predictable, directly observing it isn’t as important.

In novel situations, on the other hand, like when you’re playing against someone who hits with more spin than you’re used to, that trans-bounce information becomes crucial to success. If you don’t directly observe it, you’re going to swing to where you thought the ball was going to end up, but because you’re not used to this spin, the ball will literally never actually end up there. Due to saccadic blindness you can’t actually see the change in velocity off the ground, you’re blind when it’s revealed, and so you’ll just miss terribly every time, with no way to correct your error.

With this in mind, we need to perform our saccades strategically to ensure we never miss the most important information of all: the immediate post-bounce trajectory.

Beat the Bounce

Cricket batsmen perform what’s known as a predictive saccade as the ball comes towards them. Their eyes jump from their first fixation, the release point, to their second fixation, the bounce area, before the ball is actually bouncing. The location for this predictive saccade is chosen based on visual information gathered from the ball’s early flight trajectory.

High level batsmen perform this predictive saccade earlier than low level batsmen. The better the batsmen, the more quickly they are able to identify the location of the bounce and jump their eyes there. The goal is to pick up the ball right before it hits the ground. The ball’s trajectory off the ground then determines the swing.

On fast bowls, low level batsmen aren’t able to predict the bounce early enough to fixate there before the ball arrives. This means they’re effectively blind to the bounce, and are denied the most important trajectory information necessary for the swing: how the ball comes off the ground. As a result, on sufficiently fast bowls, they miss almost every time.

Do Tennis Returners Beat the Bounce?

Watch a slow motion video of your favorite tennis player returning serve, and you’ll notice a behavior very similar to that of the high level cricket batsmen: the returner’s head moves to the bounce area before the ball gets there.

They track this way for the very reason discussed above. In order to actually see the bounce, you have to jump your eyes to its general location before the bounce actually happens. If, on the other hand, your saccade occurs with the bounce, rather than before it, you will be blind during the bounce.

Roger Federer’s gaze arrives at the bounce area before the actual bounce transpires. He holds it there, still, as the ball bounces.

In general, elite athletes in high speed sports predict a future point of interest using visual information available during the early part of an object’s flight. They then jump their fixation to that point of interest before the object gets there, ensuring the eyes have time to refocus on that new point before the object arrives.

Aren’t We Looking Away From the Ball?

The tennis serve moves too quickly for you to keep the ball on your fovia for the serve’s entire duration. As such, you must be content to fixate on only a few, critical points of interest, lest you attempt saccades which leave you blind during critical information reveals like the bounce.

The optimal tracking strategy for high-speed tennis shots feels more like letting your eyes follow the ball than causing them to. Past a certain speed, smooth pursuit tracking won’t work, so you must be content to perform few, accurate fixations instead.

To return a fast serve, here’s what works best:

  1. Watch the server’s toss. This should cause you to also see their contact, since it occurs at the end of the toss.
  2. Allow your eyes to flick down towards the bounce.
  3. Allow your eyes to flick to, or just in front of, your projected contact point.

Let’s talk about our bounce fixation specifically. When you get it right, you should clearly observe the ball leaving the ground. Hold your gaze steady and allow the ball to bounce through your focus. If you try to whip your eyes through the bounce with the ball itself, you’ll actually see it less well.

The perfect saccade picks up the ball right before it bounces, and fixates on the bounce location throughout the duration of the bounce. You’ll be able to see the ball in peripheral vision for a few milliseconds before that, then it’ll bounce right through your focus, and you’ll still be able to see it in peripheral vision for a short time after that.

When it all goes right, you’ll have supreme confidence in what you just saw. After the bounce, your eyes will naturally perform their next predictive saccade, to your contact point, and you’ll have the same experience – seeing the ball clearly in peripheral vision as it comes in, then in crystal clear focus for a few brief milliseconds, followed by, probably, the blur of your racket striking it.

Eye Performance Takes Practice

Performing an accurate predictive saccade to the bounce area will improve your serve return, but you won’t master it overnight.

Once you tell your brain “we’re trying to observe the bounce,” your brain will begin to self correct. Every time you get that crystal clear image of the ball coming up off the ground, your brain will make a mental note that your timing and early flight projection was correct, and it will reinforce that projection model.

While you’re learning, you’ll often perform your saccade too early, or too late, or you’ll be so focused on trying to see the bounce that you forget to actually observe your opponent’s strike. When you fail to see the bounce due to saccadic masking, at some point post-bounce your eyes will perform a catch up saccade. You’ll see something, but not the ball’s change of velocity through the ground, which is the largest change of velocity that occurs during any tennis shot.

“Bounce.”

If you’re having trouble, try to say “bounce” the instant the ball lands. Not a moment sooner, not a moment later. This is very difficult to get exactly right unless you can accurately project the ball’s flight into the ground, which is the same skill necessary to perform an accurate, well-timed saccade to the bounce location.

Your Eyes Are Why You Shank Returns

Idiopathic shanks on the serve return are probably a result of saccadic blindness – you can’t trust everything you “see.” Try to differentiate between the fake vision that your brain filled in after the fact, and the real vision that your brain was actually able to use when generating your swing.

Once you succeed in jumping your eyes to the bounce area before the ball, you’ll experience a sense of control over the return, especially against heavy spin servers, that seemed impossible before.

4 Comments

  1. Philip Parker
    May 18, 2022

    Does this apply to just return of serve or is more broadly applicable to all shots?

    Reply
    1. Johnny (FTF)
      May 20, 2022

      Good question.

      This applies to every shot that bounces sufficiently far in front of you. On those shots, you get so much post bounce information that even if you flick your eyes to the bounce a little too early, you’ll be fine. Not only that, but you can basically see the entire flight in your peripheral vision, even while fixating on the future bounce point.

      On deep shots, though, it’s much trickier. The bounce is closer to you, so if you flick your eyes there too early, you’ll lose sight of the ball (and then probably miss it). “Guess the bounce as early as possible” is only a good heuristic for balls that are fast, and land well in front of you (aka serves).

      It is actually more important that your gaze is still during stroke production, than it is that your gaze is in the right place. Due to this, trying to flick your eyes to a bounce that occurs super close to you might interfere with your actual swing, and it sometimes works better to vaguely fixate at or in front of your projected contact, and watch the bounce with your peripheral vision. You definitely do want to beat the bounce on ground strokes, all else being equal, and most of the time you can, but you’ll have to experiment with it. If you feel like it’s detracting from your swing, what’s probably happening is that your eyes are darting during stroke production, distracting your brain from choosing the right movement.

      Reply
  2. Philip Parker
    June 1, 2022

    Thanks for the feedback! I have been experimenting with this technique in my rallies and find it very useful. I feel more like I’m ahead of the ball, and anticipating it better. Especially on clay where bad bounces are so common, by anticipating contact point I find I am noticing if that spot is rough, or is a line and so am more prepared for an odd bounce. This is helping me feel more relaxed as I have more time.

    Also seems to help with volleys as I am getting my racquet to contact point sooner since I am actively trying to anticipate the contact point.

    Deep balls at my feet, yes, probably not the best technique but for many of my shots this is turning out to be a game changer!

    Reply
    1. Johnny (FTF)
      June 26, 2022

      Great, glad it’s helping.

      I should state that, personally, I actually prefer bounce tracking to contact point tracking on half-volley-like shots that bounce super close to me, I’m just not sure that everyone does.

      As the ball is coming in, I perform my last saccade with a goal of picking up the ball right before it bounces. If I hit it correctly, it bounces right through my fovia, and my eye tracks it for 3 or 4 degrees without moving. It comes off the ground crystal clear when this happens.

      On these half-volley-like shots, I don’t perform another saccade to my contact point, because it happens to quickly, and my eyes would me moving during too much of stroke production if I did. I find this gives me the best chance to read the ball off the ground and hit it cleanly, with a still gaze at contact.

      I have to do more research into this particular situation, though. Every single tennis coach out there stresses the importance of watching the contact point, and I’m not willing to go against that just yet.

      When possible, we certainly want two fixations at the end of our swing – bounce and contact – and if we get both correct, we’re always going to hit it cleanly.

      Reply

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