Many players stroke with too much arm, with little body rotation. This greatly limits the power they can generate.
Many players learn to put decent spin on their serves. However, when faced with disguising this spin, they have great difficulty.
When faced with a faster or quicker opponent, many players try to match them in speed, and end up losing because of too many unforced errors...
Many players do the same shot over and over against varying incoming balls, whether they are ready for the shot or not...
Forget about the virtues of now-illegal hidden serves. Think about the advantages of letting your opponent see contact when you serve!
At every tournament, there are players who complain that the tournament ball isn’t the one they practice with.
One of the most common upsets occurs when a player wins the first game very easily and then loses the match. There is such a thing as "second game blues," where you win the first so easily you have difficulty playing all-out in the second game.
Before a match starts, you are allowed to examine your opponent’s racket. Some of your opponents will use surfaces that you might not be used to playing, such as long or short pips, or anti-spin.
Suppose you are well behind in the first game. Your only way of winning that game is if you play very well, and your opponent plays poorly. Therefore, assume this is true, and play your tactics accordingly!
Some players have very accurate pushes, and will push very wide to your backhand over and over – until they see you stepping around, or even hedging that way.