Nadal and Federer are "The Pink Panthers"

What is it with both Rafa Nadal and Roger Federer wearing pink this week in Toronto?  Nike is mum on the topic, but Federer says he will wear the pink shirt this week in Toronto and next week in Cincinnati before switching to something different for The U.S. Open. 

In Nadal's first match he wore a fluorescent pink shirt and a headband that glowed under the lights.  Both actually wore the pink well, in their own ways.

I'm sure the players are always looking to break out of the "all-whites" once Wimbledon is over.  Should the two meet in the tournament we'll have to see who blinks first and discards the pink, or will our eyes get a pink overload for a couple hours.