Top seed Roger Federer was finally forced to work hard for a win at the Swiss Indoors tournament as he fought back to beat Adrian Mannarino 4-6, 6-1, 6-3 in his quarter-final on Friday.
World No 1 Andy Murray started his new season with a surprise 7-6(4), 6-4 loss to David Goffin in the semi-finals of the Mubadala World Tennis Championship in Abu Dhabi on Friday.
Rafael Nadal reached the final of the Swiss Indoor tournament when he beat Frenchman Richard Gasquet 6-4, 7-6(7) on Saturday, a result that was good news for fellow Spaniard David Ferrer.
London's stunning 02 Arena will stage the ATP World Tour Finals for the seventh year in succession in 2015 but that will already be four too many, defending champion Novak Djokovic said on Monday.
The parade of serial grand slam champions is reserved for Tuesday at the ATP World Tour Finals but the supporting cast provided compelling opening acts with Stanislas Wawrinka and Juan Martin del Potro in the spotlight.
Rediff.com takes a look at a few such players, whose lone major title win came at the Paris Masters.
Going by current form and placement, Bikash Mohapatra says it won't come as a surprise if the Swiss maestro fails to qualify for the season-ending ATP World Tour finals.
Roberto Bautista Agut, the world No. 15, has confirmed his participation in the 20th edition of the Aircel Chennai Open, to be held at SDAT Stadium in Nungambakkam from January 5 to 11 next year.
The message from Novak Djokovic could not have been more emphatic after the Serb retained his title at the ATP World Tour Finals with a crushing victory over Rafa Nadal on Monday.
Switzerland's challenge at the ATP World Tour Finals melted away like an Alpine glacier in a heatwave on Sunday as Rafa Nadal and Novak Djokovic marched on to the grand finale.
If Stanislas Wawrinka's life depended on the outcome of one tennis match he would surely want Rafa Nadal fighting his corner, and while the stakes were not as high as life or death on Friday the Swiss player's fate was in safe hands.
The hardest nut in men's tennis again proved resistant to the heaviest of sledgehammers as Novak Djokovic absorbed the brute force of Juan Martin del Potro to book his place in the last four of the ATP World Tour Finals on Thursday.
He won 83 points to Rafael Nadal's 80, hit 30 winners to the Spaniard's 14, struck more aces and generally played the more inspiring tennis, yet it all ended in familiar fashion for Stanislas Wawrinka at the ATP World Tour Finals on Wednesday.
World No 1 Rafael Nadal broke the stubborn resistance of Poland's Jerzy Janowicz's to win 7-5, 6-4 and reach the last eight of the Paris Masters on Thursday.
Mahesh Bhupathi and Rohan Bopanna won their first match at the ATP World Tour Finals, scoring a 6-3, 5-7, 10-5 victory over Robert Lindstedt and Horia Tecau in Group B to keep their semi-final hopes alive, while Leander Paes and Radek Stepanek also made a winning start.
Former world number one Rafael Nadal ended his season on Thursday as he has yet to fully recover from a wrist injury that has hampered him since the French Open in May.
Leander Paes earned himself a shot at his third ATP Challenger title of the season by reaching the final of the $125000 Tashkent event with partner Andre Begemann, in Tashkent on Thursday.
Dominic Thiem stayed very much in the mix at the ATP World Tour Finals with a 6-3, 1-6, 6-4 victory over mercurial Frenchman Gael Monfils at the O2 Arena on Tuesday.
World number one Novak Djokovic had enough on his plate already on Wednesday without marauding Russian Daniil Medvedev pummelling him to a shock 6-3, 6-3 defeat at the ATP Finals.
Sweden's Robin Soderling, the player best-known for being the first man to beat Rafael Nadal at the French Open, has retired from professional tennis because of a long-running illness.
Roger Federer slid his racket into his bag and walked off into the shadows of London's o2 Arena on Sunday as his leanest season since 2001 came to a rather predictable end at the hands of Rafael Nadal.
Leander Paes, named a reserve in India's Davis Cup team for the Uzbekistan tie, is in line to win his first title of the season, albeit on the Challenger Tour, with Canadian partner Adil Shamasdin.
Roger Federer had not beaten a top 10 player since January until he overcame Juan Martin Del Potro in the Paris Masters quarter-finals on Friday to secure a much-needed confidence boost.
Tommy Haas kept alive his slim chances of qualifying for next month's ATP World Tour Finals when he edged past near namesake Robin Haase 6-3, 4-6, 6-4 to lift his 15th career title at the Vienna Open on Sunday.
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.
Roger Federer has pulled out of the Rio Olympics and said he will miss the rest of the season as he needs "more extensive rehabilitation" following knee surgery earlier this year if he wants to prolong his career.
Spain's Rafael Nadal defeated local boy Di Wu in straight sets to reach the second round of the China Open on Tuesday.
The opening match in the Pete Sampras Group produced a feast of stylish backhands from both players but it was Dimitrov, the first Bulgarian to qualify for the tournament in its 48-year-old history, who overcome some late jitters to prevail.
Speculation is rife that all is not well in among compatriots Roger Federer and Stanislas Wawrinka.
American Sam Querrey won his first ATP World Tour title in four years when he defeated fellow countryman Rajeev Ram 6-4, 7-6(6) at the Delray Beach Open.
Roger Federer claimed an eighth Swiss Indoor title when he outlasted Argentina's Juan Martin del Potro 6-7(5), 6-4, 6-3 in front of a partisan Basel crowd on Sunday.
Ash Barty's bid to end the host nation's long wait for a homegrown Australian Open champion will begin against Ukraine's Lesia Tsurenko
Britain number one Andy Murray has overtaken 14-time Grand Slam champion Rafael Nadal to claim the third spot in the ATP world rankings.
They now face eighth-seeded pair of Canada's Vasek Pospisil and local boy Jack Sock, whom they beat 6-1, 6-4 in Paris.
Third seeds Leander Paes and Radek Stepanek qualified for the semi-finals of the ATP World Tour Finals after winning their second Group A match on Thursday. The Indo-Czech pair beat sixth seeds Marcel Granollers and Marc Lopez of Spain 7-5, 6-4 in 92 minutes.
Roger Federer wants more blood testing done in tennis to help keep the sport clear of doping, the 17-time Grand Slam champion said on the eve of the ATP World Tour Finals.
The Indian pair of Mahesh Bhupathi and Rohan Bopanna booked the final berth at the Barclays ATP World Tour Finals in London after advancing to the semifinals of the BNP Paribas Masters in Paris.
Leander Paes and Purav Raja, who are trying to establish as a pair on the ATP World Tour, progressed to the quarterfinals of the St Petersburg Open with a straight-set win over Fabio Fognini and James Cerretani.
Leander Paes, on Sunday, won his first title of the season, combining with Canadian Adil Shamasdin to lift the Leon Challenger Tour tennis tournament's men's doubles trophy after a straight-set triumph in Leon.
Novak Djokovic said his ailing father's struggle with serious illness had inspired him to beat Roger Federer in a thrilling climax to the ATP World Tour Finals on Monday.