Yes and no, and the distinction matters. The anticipation work — reading the serve before contact, calling length early — has decent evidence behind it and is one of the clearest differences between any two levels of player. Generic visual training, meaning acuity, contrast and raw reaction speed, measures real things and those numbers do improve with practice, but whether that improvement shows up in match play is much less settled.

What it will not do is fix your technique or your fitness. What it does is sit underneath both. Seeing the ball earlier gives you more time to prepare, so your timing improves without changing a thing about your swing. It gives you longer to choose, so your decisions get better without learning any new tactics. It is a multiplier on the ability you already have, not a replacement for building that ability.

Fifteen to twenty minutes. The app builds you a session of about six drills weighted towards your weak areas, or you follow a fixed three-day week. Doing all nineteen in one sitting is how people stop after a fortnight.

For the screen drills, a laptop and a bank card for calibration. The off-screen routines need a pen, a wall and in one case a partner — they are optional, and the app tells you what each one needs before you start.

Yes. Every drill adapts to the player in front of it, so a twelve-year-old and a touring pro both end up working at their own ceiling rather than against a fixed difficulty. Under-14s in Spain need a parent to create and hold the account, which is how signup is set up.

It runs, but several drills measure how much detail you can resolve across a given visual field, and a phone screen is too small for those numbers to mean much. Use a laptop.

I'm Joaquin Marquez, a coach in Barcelona. I played four years on the ITF Futures circuit after D1 college tennis in the United States, and I coach club players and professionals.

The idea came from an eye doctor I worked with while I was competing on tour. The drills he gave me had nothing to do with hitting a ball and changed how I saw the game more than most of the hours I spent on court. I have thought ever since that this is the most undertrained part of tennis — a whole layer underneath technique and tactics that almost no one touches, and that can fundamentally change how a player reads what is in front of them. This is that work, built so it can be measured and repeated.

It depends on what you train, and the distinction matters. Reaction work built around real tennis cues — the opponent’s hit, a called stroke, a short or deep ball — has a much better chance of carrying into match play than generic light-tapping, which is why every drill here uses tennis movements and decisions. Raw reaction scores do improve with practice; how much of that shows up in a match depends on how close the drill is to the game.

What it will not do is fix your technique or replace hitting balls. What it does is sit underneath both. Splitting on the hit and preparing early gives you more time on every ball, so your strokes look better without changing your swing. It is a multiplier on the ability you already have, not a replacement for building it.

Ten to twenty minutes. Two or three drills before practice work as a warm-up, and Points and resets turns into a full on-court conditioning block when you want one.

Your phone, a few cones (water bottles work) and a few metres of space each way. A racket for the shadow strokes. Earbuds are optional for the voice-only drills.

Not yet on court: the phone gives the cues but does not watch you. The tap tests measure speed, accuracy and split step timing precisely, and after on-court drills you rate how it felt so the level adjusts. With a coach watching, that is usually all you need.

Yes. Every drill has five levels and adapts to the player, so a twelve-year-old and a touring pro both work at their own ceiling. Under-14s in Spain need a parent to create and hold the account, which is how signup is set up.

I'm Joaquin Marquez, a coach in Barcelona. I played four years on the ITF Futures circuit after D1 college tennis in the United States, and I coach club players and professionals.

As a junior I lost matches I could have won to nerves, pressure and temper. What changed it was a coach who brought mindfulness and meditation into my training alongside match tactics. I walked on at Sacramento State with a coach who did not trust me yet, and finished as one of the best players in the lineup. The focus drills here come from that work; the reaction and footwork drills come from years of trying to get to the ball a tenth earlier.

For the things that decide matches, yes. Pressure, decisions, patterns and preparation are mostly about what you do before and between shots, and video shows them clearly. Technical work happens through video analysis of your own hitting. If you need someone on court every day, the hybrid option in Barcelona or your current coach covers that.

The Kortsy app on your phone and the time to do the weekly plan. Filming your matches or practice helps, with a tripod or a fence clip for the phone, but you can start without it.

The work is the same at every level: playing your best tennis when it matters. I coach adult club players, competitive juniors and professionals. On the free call we’ll check whether it fits.

No. I’m a coach who had the same problem and learned how to compete with it. If something goes beyond what a coach should handle, I’ll tell you honestly and point you to the right professional.

Yes. Every online programme includes Court Sense Vision and Reaction for as long as we work together. I build their drills into your weekly plan, so the work on your eyes, reactions and focus fits into the same weeks as everything else.