After Juan Martin del Potro upset Novak Djokovic in the Indian Wells' semifinals, the world No. 1 says the Argentine has one of the best forehands in the game.

“He's right up there,” Djokovic said. “He has a very flat forehand and his tactics is to stay in the backhand corner and try and run around the forehand. He's basically inviting you to play on his forehand, so he has a great running forehand crosscourt, depending on the surface, but he definitely uses that as a big weapon.”