There are two ATP World Tour tournaments this week. There is a 500 level in Hamburg as the post-Wimbledon European clay court swing continues. There is also a 250 level in Atlanta, the beginning of the US Summer Series on hard courts. If you want to start sizing up potential dark horses for the US Open this year, look no further than Atlanta this week.Hamburg presents us with a 48-player draw and quite a good one at that. 16 first-round byes for the seeds leave us with some mouth-watering...

Move on over, Andy Roddick. There's a new kid in town for American tennis. We all knew that Ryan Harrison had the potential to be something special when we saw him fight at the US Open last year. We were impressed by his ability in various tournaments throughout this year. We loved his fight when he was overmatched against Robin Soderling at the French Open but took a set anyway. We knew the kid would bloom sometime, but the question was when he'd would have the mental fortitude to really...

 It is very hard before a Grand Slam to say how it will affect the rankings for most players because there are just so many players and so many points at a Slam. Anyone in the top 60 right now could move very close to the top 10 with a miracle run to the final. Now, no one ever expects players ranked that low to reach a Grand Slam final, but it just goes to show how much impact the Slams can have on the rankings. If World #60 Mikhail Kukushkin were to reach the fourth round, a much more...

Well, no one has figured out how to do it so far this year. So before we look at who in his quarter of the draw even has a chance, let's think about just what it would take to pull off this upset. 1. Protect your serve: It's harder on clay, but to even give himself a chance against Djokovic a player cannot trade breaks. Andy Murray tried that and nearly succeeded in Rome, but eventually Djokovic won out. Opponents will have to take the match one game at a time and start out by trying to not let...