Kohlschreiber is now 29 years young and still going strong, having reached the finals of three tournaments this year. He won the doubles title in Doha with countryman Christopher Kas. Next up, he faces the hottest player in tennis: Rafael Nadal (2nd, Spain). He actually has one victory over Nadal (Halle 2012) but has lost to the Spaniard nine times. I would say Kohlschreiber has a better chance of derailing the dream Federer/Nadal quarterfinal than Tommy Robredo (19th, Spain) does but that's not saying much. Robredo has never beaten Fed (7th, Switzerland) in 10 tries. The best weapon Kohlschreiber has is force of will and no one's ever going to beat Rafa at that game.