The German is the first lucky loser to reach the final of a Masters 1000 event.
Somdev Devvarman set up his biggest match of the season, a pre-quarterfinal clash with World No 1 Novak Djokovic in the ATP Miami Masters, after scripting yet another come-from-behind win, in Miami.
There is no let-up for Roger Federer as he prepares for his 12th consecutive appearance at the ATP's season-ending extravaganza.
Fourth seeds Leander Paes and Mahesh Bhupathi lost in straight sets to second seeds Daniel Nestor and Max Mirnyi to bow out of the ATP Shanghai Masters, in Shanghai on Saturday.
World No 1 Novak Djokovic began his Paris Masters title defence with a routine 6-3, 6-4 win over German Philipp Kohlschreiber in the second round on Tuesday.
Murray to practise with Djokovic in Rome before return from injury.
Nadal faced no break points in a ruthless display to set up a meeting with Canadian Denis Shapovalov.
Novak Djokovic sauntered past Spaniard Feliciano Lopez to reach the quarter-finals of the Shanghai Masters on Thursday but Andy Murray had to claw past big-serving American John Isner after losing a first-set tiebreaker.
Top seed Nadal extended his winning streak to 13 matches with a 6-2, 6-1 demolition of American Jared Donaldson in the Qi Zhong Stadium before World No 2 Federer, to the delight of his sizeable Chinese fan club, got the better of Argentina's Diego Schwartzman 7-6(4), 6-4.
Rafael Nadal continued his resurgence with a thrilling 2-6, 6-4, 6-2 victory over world number two Andy Murray on Saturday to reach the final of the Monte Carlo Masters.
Surprise package Davidovich Fokina, who knocked out top-ranked Novak Djokovic and Indian Wells champion Taylor Fritz in the earlier rounds at Monaco, drew first blood by breaking Tsitsipas to take a 2-1 lead in the opening set.
Andy Murray demolished Croatian teenager Borna Coric 6-1, 6-2 in the second round of the Paris Masters on Wednesday to set up a Davis Cup-flavoured clash with Belgium's David Goffin.
An ailing Rafael Nadal added his name to the list of upsets at the Shanghai Masters after the Spaniard suffered a 6-3, 7-6(6) loss to Feliciano Lopez in Wednesday's second round, as fourth seed Stanislas Wawrinka and in-form Kei Nishikori also made early exits. Nadal's great rival Roger Federer survived a huge scare, saving five match-points before overcoming Argentina's Leonardo Mayer 7-5, 3-6, 7-6(7).
For the first time since 2004, neither Novak Djokovic nor the injured Rafael Nadal will be in the Rome final.
India's Rohan Bopanna and his French partner Edouard Roger-Vasselin let go off five break-point chances as they lost to Marcel Granollers and Marc Lopez in the semi-final encounter of the ATP Cincinnati Masters.
Third seed and Australian Open champion Wawrinka recovered from the loss of the opening set to claim his maiden Masters title on the Monte Carlo clay just six weeks before the start of the May 25-June 8 grand slam tournament in Paris.
Richard Gasquet kept his ATP World Tour finals hopes alive when he overcame Fernando Verdasco 7-5, 6-7(6), 6-3 to reach the Paris Masters third round as fellow Frenchman Jo-Wilfried Tsonga crashed out of the race on Tuesday.
World No. 2 Carlos Alcaraz defeated Tsitsipas in the 2021 US Open and in last year's Miami Masters and Barcelona Open.
Roger Federer produced another masterly display to beat Japan's Kei Nishikori 6-3 6-2 and move a step closer to the semi-finals at the ATP World Tour Finals in London on Tuesday.
Novak Djokovic cruised past Germany's Jan-Lennard Struff 6-3, 6-1 on Wednesday to reach a record-equalling eighth Western & Southern Open semi-final in New York where he will face Spaniard Roberto Bautista Agut.
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.
'I'm disappointed and sad because after a good start to the season I was coming to a very important part of the year with very good feelings and good results.'
Fifth seeds Rohan Bopanna and Edouard Roger-Vasselin booked a quarter-final berth in the ATP Paris Masters but Leander Paes and Daniel Nestor were ousted after a straight sets defeat, in Paris.
Tsitsipas regained his composure to save a set point in the 10th game before sealing the victory in the tiebreak for his third career title.
Rafael Nadal may have won the French Open a record 12 times but the Spaniard feels this year's conditions will be the most difficult he has ever faced at Roland Garros and mean he must be at his best to have a chance of retaining his title again.
Serbia have been drawn in Group B alongside Spain, South Korea and Canada.
Dhruv Munjal on why Novak Djokovic may yet win that highly contested title.
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.
Raducanu retires in Rome as back injury persists, Jabeur survives early scare
Top seed Novak Djokovic made quick work of Tennys Sandgren at the Western and Southern Open on Tuesday, never dropping serve en route to a 6-2, 6-4 win over the American, while big-serving Milos Raonic enjoyed a straight sets win over Andy Murray.
World No 2 Novak Djokovic produced a magical display to overcome the ferocious hitting of Argentine Juan Martin del Potro and successfully defend the Shanghai Masters title on Sunday.
US Open champion Carlos Alcaraz has become the youngest world number one since the ATP rankings began in 1973.
Summary of sports events and persons who made news on Thursday
India's number one singles player Prajnesh Gunneswaran beat Jay Clarke of Great Britain in straight sets to enter the main draw of the Miami Open, on Wednesday.
'There is so much excitement brewing about Wednesday's Alcaraz and Rune quarter-finals showdown -- it could well be a juicy foretaste of things to come.'
World No 1 Novak Djokovic will meet second-ranked Andy Murray in a blockbuster final at the Madrid Open after beating Kei Nishikori 6-3, 7-6 (4) on Saturday.
Carlos Alcaraz announced himself in Madrid when he played with a sore ankle but still dispatched three top five players -- Rafael Nadal, Djokovic and Alexander Zverev -- en route to his second Masters title, just days after his 19th birthday.
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.
World number one Novak Djokovic's French Open preparations were dealt with a blow as he suffered a 6-3, 4-6, 6-2 defeat by Russian Daniil Medvedev in the Monte Carlo Masters quarter-finals on Friday.