The International Professional Tennis League (IPTL), relative to the ATP, is a lesser known tennis organization that has put on a late-fall exhibition tournament for the last few years. Although the results of the tournament do not affect ATP rankings, the event is a good way for a player to stay match sharp over the off-season. In Roger Federer's case, the IPTL event gives him a chance to get some match play in following his post-Wimbledon layoff due to his lower-body injury. A similar point could be made about American Serena Williams as she is expected to contest the event following a post-US Open layoff.

Roger Federer is part of the India Aces

The IPTL does things a little differently as they group players into teams. Currently Federer, who recently partook in the #MannequinChallenge, is listed as a part of the India Aces at the league's website. Other players on the team include Sania Mirza, Eugenie Bouchard, Ivan Dodig, Feliciano Lopez, Mark Philippousis, Rohan Bopanna, and senior Thomas Enqvist. It is not clear precisely when Federer will contest his first match as part of the India Aces this season. However, the competition for the league starts on December 2nd and the final is played on December 11th.

IPTL rules for tennis are tweeked a bit when compared to the ATP, WTA, and Grand Slam events.

Some points are worth double, player substitutions are allowed, there are no service lets, and a basketball-like shot clock is employed. Furthermore formal time-outs are allowed and in-match coaching, things that are not permitted on the men's tour and only half-permitted on the women's (ie. there is some in-match coaching on the WTA).

Serena Williams part of the Singapore Slammers

Other teams that are in the IPTL are the Japan Warriors, the United Arab Emirates Royals, and the Singapore Slammers. Kei Nishikori is the biggest current name on the Japan Warriors. The Royals have Tomas Berdych and Martina Hingis. Meanwhile the Slammers have Serena Williams and Nick Kyrgios.

Federer appears to be a recent addition to this season's tournament as he did not feature in a November 24th news release from the website.

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