Rafael Nadal Who Would You Rather ...

Novak Djokovic of Serbia and Rafael Nadal of Spain, the top two tennis players in the world, will duke it out for the United States Open title this afternoon at 4 p.m. EST.

Nadal has 10 career Grand Slam titles to Djokovic's three, but in 2011, Novak has held the upper hand, besting Rafael at Wimbledon to claim the world No. 1 ranking.

Who do you think will win this clash of tennis titans? All bets are off.

More importantly, though ... who's the bigger hunk? Vote below!

The final four young men competing in the U.S. Open over the weekend are all pretty awesome at tennis. And are pretty awesome-looking without shirts.

While two were eliminated from the tournament Sunday (Roger Federer plays Juan Martin del Potro for the title this afternoon) all are in the running here.

Who do you think is hottest? Take a look and vote in the poll below!

There's Juan Martin Del Potro shirtless ..

Or Novak Djokovic shirtless ...

Or Roger Federer shirtless ..

Or Rafael Nadal shirtless ...

Which tennis star is the hottest?