Djokovic is playing a wonderful season, but I think he can't win forever. Yesterday he showed some signs of weaknesses against Gael Monfils and was very close to elimination. Monfils controlled the match, he even won the first set 6:3 and it seems he will win the match. But then Monfils lost the power, I even thought he will abandon the match. It was strange how poor Monfils played the second, specially the third set. And You mast play on the highest level against the World Number one.

Tomas Berdych is playing very good in Cincinnati. He won the first three matches without loosing any set. Here are the results:

19.08.2011. Berdych, Tomas vs. Federer, Roger 2:0 (6:2, 7:6)
18.08.2011. Berdych, Tomas vs. Almagro, Nicolas 2:0 (6:2, 6:2)
16.08.2011. Berdych, Tomas vs. Monaco, Juan 2:0 (7:6, 6:0)

The mutual results are of course on Djokovic side. But it is important to be mention that Berdych won the last season (2010) semifinal in Wimbledon. Not only won, but he outplayed Djokovic. On 02.07.2010 Berdych won 3:0 and showed he has the quality for highest results. Considering all previous mentioned facts, I think Berdych is able to make a small surprise.