We can't really think of a concrete reason as to why it looks like David Schwimmer takes tennis so seriously, so we're gonna go ahead and guess it's because his last name rhymes with "swimmer" and swimmers are suspect of non-water sports like tennis.
That's a stretch, but what if it were TRUE?? Minds blown!
David attended day 9 at the 2013 Tennis US Open — taking a much needed break from all that paleontology and graffiti — with a very pretty blonde who had a very shiny cup. It looked like he was trying to shoot lasers out of his eyes to knock the ball out of play or something, which would have been totally rude had it worked!
Cheer up, David! Tennis should make you either extremely happy or extremely sleepy — never furiously serious!
Just take a note from this guy: