Originally Posted by Mike2228
Is thinking too much the very worst thing you can do on a tennis court? I find I play much better when I rely on instinct.
Over thinking and/or trying to make too many adjustment on the court can be a disaster. However you'll usually get it sorted out eventually and improve at the end of it, even if it takes a while.
As LeeD said, there are worse things than overthinking, just a few:
* not trying new things/improving in practice
* mindless, no strategy, aimless hitting
* deer in headlights reaction when things aren't working in a game, locking up mentally when you need to be seeing/thinking clearly what needs to be changed in the middle of a game.