Roger Federer and Rafael Nadal, the world's top two players and Wimbledon finalists, have secured their places in the eight-man field for the season-ending Masters Cup in Shanghai from November 12-19.
Federer mathematically qualified for the Masters after his quarterfinal victory at Roland Garros last month, making it the earliest official qualification in the history of the tournament.
"I'm looking forward to playing in Shanghai for the third time," Federer said.
"I reached the semi-finals the first year and the final last year so I hope to go one step further this time. I love playing in China and the stadium is great."
Nadal, who has won 33 of his last 34 matches this year, guaranteed his Shanghai place courtesy of his first-ever Wimbledon semifinal appearance.
"I went to Shanghai last year and was really excited about playing, but unfortunately I was injured and couldn't play," said Nadal.
"I have always said that my goal was to qualify for the Masters Cup in Shanghai and I am very happy now that I've done it. Hopefully there will be no problems this year and I'm really looking forward to coming and playing in front of all my fans in November.