It’s always a good idea to put fresh grip on your racket before a tennis match.
Many players make the mistake of adding the thin sticky side to the bottom of the racket. This causes the sticky residue to build up, which leaves a bump on your racket and ruins your grip.
Instead, start with the thicker side of the grip and wrap around the butt of the racket. Make sure you overlap the grip slightly as you move up the handle. Keep the grip in place by adding tape to the throat of the racket.