Unseeded German Benjamin Becker stunned third-seed Tomas Berdych to reach his first ATP final at the Thailand Open on Saturday.
Rafael Nadal had just beaten rising Greek force Stefanos Tsitsipas in a classic scrap at the ATP Finals but had no idea whether it was good enough to keep him in the tournament.
There is no let-up for Roger Federer as he prepares for his 12th consecutive appearance at the ATP's season-ending extravaganza.
Roger Federer will make his return to the tennis circuit from a double knee surgery at an ATP 250 tournament in Qatar in March, having not played since last year's Australian Open.
The Russian was too strong for second seed Berdych in the semis, Kohlschreiber went through to his first ATP final beating fourth seed Marcos Baghdatis.
Three-times champion and world number one Novak Djokovic has been drawn in a group with U.S. Open champion Marin Cilic in next week's season-ending ATP World Tour Finals in London.
Rafael Nadal pulled off an incredible recovery from 1-5 and match-point down to overcome Russia's Daniil Medvedev at the ATP Finals.
India's Sumit Nagal becomes 1st Indian to win match at Masters on clay since 1990!
Top seed Somdev Devvarman won his match against Jordi Samper Montana of Spain via a walkover to set up a semi-final clash with his Indian compatriot Yuki Bhambri in the $50,000 ATP Challenger Tennis tournament in Chennai on Thursday.
Summary of sports events and persons who made news on Saturday
Roger Federer eased his way into the ATP World Tour Finals with a 6-1, 7-6 (0) defeat of Canadian newcomer Milos Raonic in his opening round-robin match on Sunday.
Alexander Zverev booked his place in the last four of the ATP Finals where he will face world number one Novak Djokovic after a 6-2, 6-4 win over Hubert Hurkacz in Turin on Thursday.
Sam Querrey reached his third consecutive ATP final by upsetting top-seeded German Tommy Haas 6-3 7-5 at the LA Open on Saturday.
Roger Federer called for a merger between the two governing bodies last month, with both Simon and ATP Tour Chairman Andrea Gaudenzi welcoming the suggestion. But some top WTA players have said they want an equal standing for the women players in a combined body.
The winners of the Serbia-Germany tie will join Spain, Russia and Italy in the semi-finals.
World No 1 Novak Djokovic swept aside opponent David Ferrer of Spain in straight sets to set up China Open summit clash against third-seed Rafael Nadal.
Italy sealed a place in the semi-finals of the ATP Cup by winning both singles matches against France
Novak Djokovic will be favourite to reach his 27th Grand Slam final when he faces Stefanos Tsitsipas in the French Open semis on Friday but what had been a smooth path through the draw has suddenly got a little rocky.
Novak Djokovic proved to be a calming influence throughout
Factbox on Daniil Medvedev, who defeated world number one Novak Djokovic 6-4, 6-4, 6-4 in the US Open final on Sunday to win his first Grand Slam title.
Friday's match was a straight shootout for a last-four place, with world number five Rublev the favourite having won his four previous matches against Ruud.
Sumit Nagal had to be content with a runner-up finish at the ATP Tulln Challenger event after losing the singles title clash in straight sets to Czech Republic's Vit Kopriva, in Tulln on Sunday.
Frenchman Lucas Pouille claimed his first ATP title by beating Austrian top seed Dominic Thiem 7-6(5), 6-2 in the Moselle Open final in Metz on Sunday.
Top seed Carlos Alcaraz snapped Daniil Medvedev's 19-match win streak with a 6-3, 6-2 rout in the Indian Wells final on Sunday.
IMAGES from the French Open quarter-finals played in Paris on Tuesday.
The duo, who had won the Australian Open earlier this year, overcame several unforced errors in the first set to win the gruelling quarterfinal 3-6, 7-6 (4), 10-7.
Photos from the ATP World Tour Finals matches played in London on Tuesday.
World number one Carlos Alcaraz will not play in the Australian Open after picking up a right leg muscle injury during pre-season training, the Spaniard said on Friday.
Mahesh Bhupathi and Mark Knowles won the euro 891,000 ATP Swiss Indoor tournament in Basel on Sunday beating Christopher Kas and Philipp Kohlschreiber of Germany.
Factbox on Carlos Alcaraz, who beat seven-time champion Novak Djokovic
Novak Djokovic said he is still hoping for a final chapter in their storied rivalry.
But for the first time, that golden trio will be having an anxious glance over their shoulders. The past week in London has revealed a new fearlessness in the generation of 20 somethings expected to fill the void when they call it a day.
Spain's Rafael Nadal said on Wednesday that he is not sure if he will be able to play at next month's French Open.
A mouthwatering finale to the season ended before it even began on Sunday when Roger Federer was forced to pull out prior to the ATP World Tour Final showdown with Novak Djokovic.
Images from the US Open men's singles second round matches, at Flushing Meadows, New York, on Thursday.
Laslo Djere won his first ATP title at the Rio Open on Sunday and then captured the hearts of the Brazilian crowd with a victory speech dedicated to his parents, both of whom died from cancer.
Tsitsipas made short work of Norwegian eighth seed Casper Ruud as he seized a third Monte Carlo Masters title in four years with a 6-1, 6-4 victory on Sunday.
ATP, WTA cancel China events, including Shenzen Finals
Roberto Bautista Agut predicted a great future for Jannik Sinner after going down to the Italian teenager