Yep, they nearly always do. Goran Ivanisevic played when Serbia won it, the likes of Sampras, Agassi, Mcenroe played for the Americans when they won it, Borg for Sweden in 1975 and so on.
It's a bit more than that. Any more like this and I'm going to end up spread-betting on the time of corners of random Premier league games to recoup my money!
Goffin looks absolutely shit. He is finding the net half way up, his serves are going a foot over the line, and he is moving about the court like a 45 year old who plays the game to keep himself in shape. In all seriousness, I'm wondering whether tennis has a match fixing problem.