This one was tense!
He thought about inviting his bestie Lukas Haas, but since Lukas seemed soooo bored the last time, DiCaprio was all like, “No way!”
So, he sat with another manfriend and watched Nadal hit his way to the trophy!
And we're betting he was rooting for the Spaniard since Nadal did a Leo impression while yachting.
P.S. CLICK HERE to see our gallery of celebs at the US Open!
[Image via Joel Ginsburg/WENN.]