
The evergreen Roger Federer —
The 31-year-old Swiss champion has enjoyed another stellar year at the top of the men's game, winning six titles in 2012, including a seventh Wimbledon crown. He is the oldest men's singles champion at the All England Club since Arthur Ashe in 1975 and joins Andre Agassi and Pete Sampras as the only 30-somethings to win a grand slam this century.

Haas enjoys resurgence aged 34 —
At the age of 34, Germany's Tommy Haas has also enjoyed a successful year on tour rising up the rankings and is currently no.21 in the world. The former world no.2 beat Roger Federer in the ATP tournament in Halle, Germany in June. "Maybe 30 is the new 20," says Haas.

Melzer joins 30-something winner's list —
Austria's Jurgen Melzer has also enjoyed a good year. The 31-year-old is currently ranked 37 in the world and won the ATP tournament in Memphis in February.

Dream team: Gil Reyes and Andre Agassi —
Gil Reyes (left) was Andre Agassi's fitness trainer throughout his career. The pair formed a formidable working partnership and a strong friendship off court. Agassi played with "great relevance," says Reyes right up to his retirement at the age of 36. Reyes and Agassi recently launched BILT -- a suite of training equipment modelled on the workouts the pair devised during Agassi's career.

Agassi's strength on court —
Agassi won five of his eight grand slams in the latter half of his career and was world no.1 at the age of 33. "When you stop and think about it, that's amazing," Reyes says. The 1999 French Open was one of Agassi's greatest acheivements, coming back from two sets to love down to win in five sets against Ukraine's Andrei Medvedev.

Agassi calls it a day aged 36 —
Agassi bids farewell to his playing days in the third round at the 2006 U.S. Open. "He was a factor all the way through," says Reyes. "I can say, honestly, that he was, if not the strongest player on the tour, one of the strongest. Playing to 36 in this day's game it takes a lot."
![Darren Cahill (left) and Gil Reyes worked together to keep Agassi at the top of his game. "After a tournament, Darren [Agassi's former coach] would often say: 'get him in the gym, because I see a different guy on the court when he's been in the gym,'" Reyes said.](https://media.cnn.com/api/v1/images/stellar/prod/121008090955-reyes-cahill-tennis.jpg?q=w_3496,h_2316,x_0,y_0,c_fill/h_447)
Cahill and Reyes —
Darren Cahill (left) and Gil Reyes worked together to keep Agassi at the top of his game. "After a tournament, Darren [Agassi's former coach] would often say: 'get him in the gym, because I see a different guy on the court when he's been in the gym,'" Reyes said.

Federer eyes more silverware —
As the season draws to a close, Federer will be looking to defend his ATP Tour Finals title he won in 2011 (pictured). The six-time winner is already the oldest champion in the tournament's history. He's a class apart, Reyes says. "Roger is a perfect athlete -- his movement, his game, his mental, his physical. There's Roger and then there's everyone else."