Court Notes Coaching
The one thing your coach should tell you after a match.
Not five things. One. How we pick the weakest well-sampled area on device, and why we refuse to guess.
ONE FOCUS, THEN THE NEXT BALL Most post-match advice fails for the same reason: it is a list. Fix your backhand, come to the net more, drink more water. A list is not a focus. PlayDNA’s coach gives you exactly one thing to work on, and this note is about how it picks it.
01 — One focus, computed
After a match, the app looks at five areas — overheads, net play, backhand, serve and consistency — and finds the weakest one that has enough good data behind it. “Enough” matters: a focus drawn from three samples is a coin flip wearing a lab coat. If no area is well sampled, the coach does not invent one. It says: record a fuller match.
02 — What we saw, not what we felt
Each focus comes with its evidence: the observation, the tiles behind it, the count that backs it. “Your backhand volley win rate fell away after the first set — 0.55 to 0.41 over 40 samples” is a sentence you can argue with. “Your backhand felt off” is not.
03 — The next session
The observation comes with a drill from a small library we actually use on court — “Shadow, load, strike”, “Two up, two back”, “Cross-court chain”, “Ten targets”, “Metronome rallies”. One drill, ten minutes, aimed at the one focus. Next match, the same area is measured again. Progress is the receipt, not the promise.
“A coach who says five things has said nothing. Say the one thing the data can defend.”