List player routines/odd habits during matches
I thought it might be amusing to list all the quirks of the players during matches.
For example, Clijsters picked up Hewitt's head bobbing and string picking between points while she dated him. Even after they broke up, she kept this quirk up until she retired.
Sharapova, Ivanovic, Hantuchova and Peer all turn their backs to their opponents and pump themselves up between almost every point.
Serena frequently fixes her earrings.
Jankovic uses tissues and fixes her ponytail.
What are/what were some others?