I noted a couple of new OCD player behaviours this week during the French Tournament:
On the downside, Nadal seems to have taken treating the ballboys as butlers to a new level - he now needs not 1 but TWO towels handed to him as he walks back to his chair. What he does he need them for?
It's pleased me to notice Maria's little shuffle she does to avoid walking on the white lines. She does it before serving (if she has to cross the baseline); and at end-changes, where she will deliberately divert to the service-line/side-line junction so she can do her little shuffle.
I'm surprised I've never heard the latter mentioned in commentary - once you notice it, it stands out a mile at every change of ends! (A quick google suggests that Nadal does something similar.)
I know plenty of athletes have their superstitions and rituals, but I hadn't noticed this white-line business before.