Isner: I believe I can win a Grand Slam title

After his 7-6 (7), 3-6, 7-6 (5) upset of world No. 1 Novak Djokovic in the semifinals of the BNP Paribas Open at Indian Wells, John Isner says that he has the ability to win a major. Isner also upset world No. 3 Roger Federer last month in Davis Cup.

"I believe I can," said Isner, who will crack the Top 10 when the rankings are released next week. "You know, Slams are tough. It's the most physical, in my opinion. You're playing three out of five. If I were to run up against Djokovic again in a Slam; even if, you know, we were playing three out of five today, I would have to finish him off with one more set. So I know it's so tough, but I enjoy the challenge. There are three more this year, and I'm gonna try to do the best I can."