How big is Roger Federer's Garage?

Roger Federer just won the U.S. Open for the fifth straight year. This means that he also won a "free" Lexus (I would assume that this works in the same way as on game shows) for the fifth straight year. And he probably has won other cars at other tournaments and he probably already has an endorsement deal with a different car company, while definitely preferring to drive a DeLorean around Switzerland.

So my question is: What does Federer do with all those cars?