Roger Federer cheers for Serbia??

I'm not sure if you know that one of the Serbian symbols is three-finger salute, a salute with the thumb, index, and middle fingers. You, who like Novak, probably noticed that before. After every victory Nole shows 3 fingers, and that's something all Serbian athletes do after winning matches.

Now, why do I mention this? Well, at the opening ceremony today I noticed that Roger Federer showed that Serbian sign. Does it mean something? Maybe Roger cheer for Nole!? Oh, I would love to see that!