Watch List: Wawrinka returns to action, Federer begins grass season

Stan Wawrinka headlines the Queen's Club while a packed women's field heads to Birmingham, England for the Aegon Classic in this week's Watch List.

Aegon Championships (London, England)

[Complete draw]

No time to rest for French Open champion Stan Wawrinka. He's back in action this week at Queen's Club along with top-seeded Andy Murray and Rafael Nadal, who started his grass season with a title last week in Stuttgart, Germany. Upgraded to an ATP 500-level tournament, the Queen's field, which has been spotty at times, is now packed. 

Wawrinka, seeded No. 2, will open against Nick Kyrgios in the first round, while Nadal opens against Alexandr Dolgopolov. Wawrinka and Nadal could play each other in the quarterfinals. 

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Milos Raonic also returns to action at Queen's Club. Raonic, a Wimbledon semifinalist last year, was forced to skip the French Open due to foot surgery. This is his first tournament back. 

Another name to keep an eye on is Grigor Dimitrov. The Bulgarian is the defending champion at Queen's and made the Wimbledon semifinals last year. That's a lot of points to defend for a player who has yet to build on his strong 2014 season. He could play Murray in the quarterfinals. 

John Isner and Sam Querrey are also in the field. 

Aegon Classic (Birmingham, England)

[Complete draw]

Simona Halep, Ana Ivanovic, Angelique Kerber, and Eugenie Bouchard headline a high-quality field at the Premier-level tournament in Birmingham, which also includes Victoria Azarenka. 

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Halep and Bouchard are the two most intriguing names on the draw. While Bouchard's slump—she's lost nine of her last 10 matches—has grabbed the headlines, Halep hasn't been her best since the spring hard courts. Her second-round exit from the French Open was a shocker and she'll look to get back into the groove this week. 

Despite playing top-5 tennis, Azarenka continues to fly under the radar. A series of tough draws have impeded her ability to get deep into tournaments and get her ranking up. Grass has never been her best surface but she has a good draw to get deep this week. 

The Gerry Weber Open (Halle, Germany)

[Complete draw]

Roger Federer kicks off his grass season at the ATP 500 tournament in Halle, where he'll attempt to defend his title and win the tournament for a record eighth time. He's the top seed, with Kei Nishikori, Tomas Berdych, and Gael Monfils rounding out the top four seeds. With no byes for the top seeds, the tournament kicks off with a number of tough first-round matches. Federer opens against Philipp Kohlschreiber, Nishikori against Dominic Thiem and Monfils takes on Lukas Rosol. 

Also in the draw are Steve Johnson, who opens against Bernard Tomic, and Donald Young, who plays Borna Coric.