Seriously, look at this photo:
He looks that happy after beating Roger Federer in a quite meaningless match in Abu Dhabi. Which is like looking happy after taking out the trash. If your cordial nemesis was also taking out the trash, but you did it better. And it maybe wasn’t even your trash, but you figured you’d do it, just for kicks. And then someone gave you a spittoon? And you were just thrilled.