Hmm, one should be careful of judging another person's motivations in their picks. I could very well be jinxing Benneteau, so that Djokovic will make it to the semifinal, etc.

If that were the case, I wouldn't want to confirm that though for obvious reasons. Of course, many people don't believe in jinxes, or that sort of stuff.
And sure, if one seriously feels a favored player is ripe for an upset, for whatever reason, it is the ideal time to call it, no?
I've made far more money than I've lost doing just that. But you have to really know just when to do it, and not overdo. Betting on a favorite is easy, but doesn't usually get you quite as much return.
Respectfully,
masterclass