Juan Martin del Potro took advantage of an error-strewn Marin Cilic performance to beat the defending champion for a seventh time in a row on Saturday to set up another Swiss Indoors final showdown with Roger Federer.
The top seed was broken in the second game of the second-round match by the big-serving German but, after going 3-1 behind, the 37-year-old hit back to win five successive games in 13 minutes and take the first set.
The world No 1 will meet Paradorn Srichaphan in the last four of the Swiss Indoors tournament.
'The Laver Cup next week in London will be my final ATP event. I will play more tennis in the future, of course, but just not in Grand Slams or on the tour.'
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.
Stan Wawrinka outlasted Frances Tiafoe over three sets to set up an all-home quarter-final against compatriot and fellow veteran Roger Federer at the Swiss Indoors on Thursday. The 34-year-old Waewrinka, who won 6-3, 3-6, 7-5, will attempt to beat Federer for only the fourth time when they meet for their 27th clash on Friday in a dream tie for the Basel crowd.
Rafael Nadal, after having suffered a 6-2, 7-6 (7-4) loss in the quarter-finals of the Swiss Indoors to teenager Borna Coric, has shut down his season to undergo appendix surgery.
Roger Federer has his sights set on ending the year as the world's top-ranked player after the 33-year-old claimed his fifth title of the year in his home town.
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.
Roger Federer became the latest withdrawal at this week's Paris Masters when he pulled out due to exhaustion.
World number one Carlos Alcaraz retired injured against Holger Rune at the Paris Masters on Friday, sending his fellow 19-year-old through to the semi-finals, while Novak Djokovic and Felix Auger-Aliassime also sealed places in the last four.
Roger Federer ended Grigor Dimitrov's seven-match winning streak and showed the Bulgarian he has some way to go to live up to his 'Baby Federer' tag with a 6-3 7-6 (2) quarter-final victory at the Basel Open on Friday.
Roger Federer extended his dominance over Andy Roddick on Saturday, notching his 20th win in 22 meetings against the American as he won 6-2, 6-4 to reach the final of the Swiss Indoors in Basel.
Indian Davis Cupper Mahesh Bhupathi and Mark Knowles cruised into the finals of the euro 891,000 ATP Swiss Indoor tournament, defeating Argentine pair Jose Acasuso and Agustin Calleri in straight sets in Basel on Saturday.
Stanislas Wawrinka fluffed two match points, crashing out 3-6, 7-6, 7-6 to Germany's Benjamin Becker in the first round at Swiss Indoors.
Roger Federer beat Finn Jarkko Nieminen 6-3, 6-4 to defend his title in Basel and top the year-end rankings.
The world No 1 will face unseeded Finn Jarkko Nieminen, who defeated 2006 Australian Open finalist Marcos Baghdatis 7-6 6-2 in the other semi-final.
The world number one crushed Argentina's Juan Martin del Potro 6-1, 6-4 in the Swiss Indoors second round.
Madrid Masters winner David Nalbandian suffered a shock first round defeat at the Basel ATP event.
The world No 1 made an emphatic start at the Swiss Indoors, beating Czech qualifier Tomas Zib in the first round.
The third seeds went down to the unseeded Croatian pair of Ivo Karlovic and Lovro Zovko at the Swiss Indoors tournament.
Defending champion David Nalbandian beat top seed Andy Roddick 7-5 7-5 in the Swiss Indoors semi-finals.
The Wimbledon champion was dumped by the world No. 47 in the second round of the Swiss Indoors.
Roger Federer has now won all the seven finals he has contested in Cincinnati. Rediff.com takes a look at a few other events that have ensured prolific returns for the Swiss master.
Roger Federer is no longer chasing the top ranking and would rather be a contender at Grand Slams than battling Novak Djokovic and Rafa Nadal to be world number one, the Swiss tennis great said.
Caroline Wozniacki overcame a mid-match wobble and withstood a barrage of big hitting to get her WTA Finals title defence back on track with a 7-5, 3-6, 6-2 victory over Petra Kvitova at the Singapore Indoor Stadium.
Former world number one Roger Federer looked like his old self when he beat Argentine Juan Martin Del Potro 6-3, 4-6, 6-3 at the Paris Masters on Friday to set up a semi-final clash with Novak Djokovic. Top seed Rafa Nadal destroyed local favourite Richard Gasquet 6-4, 6-1 as he stepped up his bid for a record sixth Masters Series crown in the same season.
A hoped-for fight to the finish for the year-end number one ranking at next month's ATP World Tour Finals in London will likely be a coronation for Rafael Nadal, who is virtually guaranteed ending 2017 top of the pile.
The 22-year-old, 6ft 6in Russian, already the owner of two indoor hard court titles this year, moved one step away from the biggest title of his career at the Bercy indoor arena, crushing his Austrian friend in 70 one-sided minutes.
Marin Cilic and Milos Raonic booked their spots in the Paris Masters second round on Monday, while Roger Federer pulled out of the tournament with next month's ATP Finals on the horizon.
Top seed Stanislas Wawrinka lifted his fifth ATP World Tour title and second Chennai Open trophy after a convincing straight sets win over Edouard Roger-Vasselin in the final on Sunday.
Rafael Nadal's announcement on Friday that he will miss the ATP World Tour Finals because of appendicitis ended a difficult year for the Spaniard during which he has endured injury, illness and worrying defeats.
Rafael Nadal is recovering satisfactorily from appendicitis and will continue a course of antibiotics in a bid to be fit for the remainder of the 2014 season, the World No 2's spokesman said on Thursday.