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Roger Federer paid for his errors as he lost to Japan's Kei Nishikori in his opening group match at the ATP Finals.

The Swiss, chasing a 100th career title at the season-ending event, lost 7-6 (7-4) 6-3 to the world number nine.

Novak Djokovic (left) replaced Rafael Nadal at the top of the world rankings in October

A planned exhibition match between Novak Djokovic and Rafael Nadal in Saudi Arabia has been called off because of the Spaniard's ankle injury.

The world's top two ranked players were due to meet in Jeddah on 22 December.

Ukrainian twins Gleb and Vadim Alekseenko have been banned from tennis for life and each fined $250,000 (£190,018) for match fixing.

The pair were found guilty of multiple match-fixing offences at a number of ITF Futures tournaments between June 2015 and January 2016.

World number 28 Verdasco became frustrated after a delay in receiving his towel between points

A Wimbledon chief has called for greater "mutual respect" after a video clip showed Fernando Verdasco gesturing at a ball boy to hurry up with a towel during last month's Shenzhen Open.

Mick Desmond, commercial and media director of the All England Club, added he was "not afraid" to fine players.

Billie Jean King says Serena Williams was "totally out of line" for her outburst in the US Open final, but also believes umpire Carlos Ramos "blew it".

Williams, beaten in straight sets by Naomi Osaka, was docked a game for verbal abuse, having already had a point penalty for smashing her racquet and a code violation for coaching.