Andy Roddick, John Isner, Mardy Fish, and Nicolas Almagro in Action This Week

The ATP Tour features three tournaments this week—one in North America and two in Europe.

In the United States, Atlanta hosts a stop on tour. The city will feature a 250-level hard court event. John Isner is the top seeded player in the tournament and he is fresh off a title from ATP Newport. 

Back-to-back titles are hard to pull off on tour, and there is a fair bit of talent in the draw besides Isner. Mardy Fish, Kei Nishikori, Andy Roddick, Kevin Anderson, Ryan Harrison and Brian Baker will all be gunning for the title.

Gstaad, Switzerland will be featuring a 250-level clay court tournament this week. Janko Tipsarevic is in the tournament as the top seed and he was also a title winner last week.

This event is not as loaded in talent as the event in Atlanta. Having said that, it will still feature Marcel Granollers, Stanislas Wawrinka, Mikhail Youzhny and Bernard Tomic.

The most important tournament of the week in terms of ranking points will be played in Hamburg, Germany. ATP Hamburg is also a clay court event, but it is part of the 500-series on tour.

Nicolas Almagro, fresh off a run to the final of ATP Bastad, is the top seeded player in the event. However, the draw is fairly deep, with Gilles Simon, Juan Monaco, Marin Cilic, Fernando Verdasco, Philipp Kohlschreiber, Florian Mayer and Viktor Troicki all seeded in the tournament.

There are several potentially dangerous unseeded players in the draw, including Tommy Robredo and Tommy Haas. Robredo has been gaining a lot of ground in the rankings as he looks to salvage his 2012 season. Haas is perhaps quiet right now, but he did win a title just before Wimbledon and he may prove to be a factor once again.

There are tons of challengers and futures events being played this week. Notable names in the challenger draws include Robby Ginepri, Vasek Pospisil, Yuki Bhambri, Victor Hanescu, Thiemo de Bakker and Olivier Rochus.