The world number five Spaniard has won 15 straight matches since returning from a foot issue that sidelined him for nearly six months last year.
Roger Federer became the first player to win the ATP World Tour finals six times when he beat France's Jo-Wilfried Tsonga 6-3, 6-7, 6-3 in the final at the O2 on Sunday.
Unseeded Italian Andreas Seppi won the first ATP title of his career in extraordinary circumstances on Saturday when Serbian opponent Janko Tipsarevic retired hurt in a rain-interrupted Eastbourne International final.
Top seed Andy Murray cruised past Spain's David Ferrer 6-2, 6-3 on Saturday and Bulgaria's Grigor Dimitrov received a walkover into the China Open final after Milos Raonic withdrew due to an ankle injury.
Rafael Nadal continued his quest for a maiden Paris Masters title when he survived a second set blip to beat Uruguay's Pablo Cuevas
Prakash Amritraj and Harsh Mankad are one step away from winning ATP challenger Tour's doubles titles, having reached the final of different events along with their respective partners.
World number one Rafa Nadal notched up his 500th career win on Saturday and clinched a place in the Barcelona Open final by beating unseeded Croatian Ivan Dodig 6-3, 6-2.
Seventh seeds Leander Paes-Radek Stepanek caused a major upset, beating formidable top seeds Mike and Bob Bryan 6-4, 6-4, but Mahesh Bhupathi-Rohan Bopanna went down 2-6, 4-6 to second seeds Max Mirnyi of Belarus and Canada's Daniel Nestor.
The Indian pair of Leander Paes and Mahesh Bhupathi bowed out of the Barclays ATP World Tour Finals after losing to eighth-seeded Poles Mariusz Fyrstenberg and Marcin Matkowski via the super tie-break in the semi-finals in London on Saturday. Fyrstenberg and Matkowski needed an hour and 39 minutes to prevail over the fourth seeds and three-time former finalists 6-4, 4-6, 10-6 and reach their 31st tour-level doubles final.
Defending champion Tomas Berdych advanced to the Stockholm Open final after his opponent Marcos Baghdatis was forced to withdraw from their semi-final due to injury trailing by a set.
Cilic marches past Querrey into Queen's semis
Indian Davis Cupper Rohan Bopanna and Aisam-ul Haq Qureshi extended their good run at the ATP South Africa Open to the final after scoring a hard-fought semi-final victory in the doubles event. The third seeded Indo-Pak pair edged past the fifth seeded American duo of Erico Butorac and Rajeev Ram 7-6(5), 6-4 in the semi-finals on Friday night.
The 14-time Grand Slam winner said he is happy and proud to have reached the summit of the game for a fourth separate spell.
Paes and his Italian partner Daniele Bracciali were shown the exit at the Thailand Open, in Bangkok, while Somdev and his South African partner Rik De Voest went down fighting in their last four match at the Malaysian Open, in Kuala Lumpur.
The Indian pair of Mahesh Bhupathi and Rohan Bopanna squandered two match-points before losing to Jonathan Marray and Frederik Nielsen in their opening match at the ATP World Tour Finals, in London, on Tuesday. The Indians, making their debut as a pair in the elite season-ending event, lost their Group B match 6-4, 7-6(1), 10-12 in 96 minutes.
India's second seeds Purav Raja and Divij Sharan were upset in straight sets in the final of the Tashkent Challenger by the unseeded Russian pairing of Mikhail Elgin and Teymuraz Gabashvili, in Tashkent, on Saturday.
Nadal struggled with the problem in the build-up to the year's first Grand Slam
Rohan Bopanna often gets baffled to find the love of playing Davis Cup diminishing with passage of time.
World number one Andy Murray has voiced his support for changes designed to speed up tennis being tested at the inaugural Next Generation ATP Finals in Milan this November.
Somdev Devvarman entered the final of the Lexington Challenger after Xavier Malisse retired from the semi-final with an injury.
Harsh Mankad and Scott Oudsema had to be content with a runners-up finish at the ATP Challenger event at Louisiana in United States after losing the valiantly fought final against top seeded American pair of Bobby Reynolds and Rajeev Ram.
Rohan Bopanna and Florin Mergea had to be content with a runners-up finish at the ATP Apia International after losing the summit clash to Bruno Soares and Jamie Murray in Sydney.
Former world number one Andy Murray's quest for a first ATP title in over two years ended in defeat at the hands of top seed Aslan Karatsev at the Sydney Tennis Classic on Saturday, with the Russian easing his way to a 6-3, 6-3 win.
Richard Gasquet won his first ATP title in more than two years when he continued his domination of Gilles Simon by swatting aside his French compatriot 6-2, 6-1 to claim the Thailand Open on Sunday.
Top seeds Leander Paes and Lukas Dlouhy earned a shot at their second title of the season after reaching the summit clash of the UNICEF Open with a win over Benjamin Becker and Scott Lipsky.
Fritz delivers as US win inaugural United Cup crown
Rafael Nadal ended Andy Roddick's bid for a record fifth title at Queen's by charging into the final with a 7-5, 6-4 win.
Nine-times Wimbledon men's doubles champion Todd Woodbridge said on Thursday it was "heartbreaking" to hear the All England Club had made the decision to cut the event to best-of-three sets rather than five from this year.
Spain's David Ferrer stunned World No. 1 Novak Djokovic to reach the ATP World Tour semi-finals on Wednesday, outplaying the Serb 6-3, 6-1 at the O2 Arena.
Mardy Fish beat Ivo Karlovic 7-6, 6-4 to reach the final of the ATP event in New Haven.
Sloane Stephens said she is ready to turn the page on a disappointing 2019 and shift her focus to climbing the world tennis rankings to qualify for next year's Tokyo Olympics.
Fernando Verdasco made a good start in his latest bid to secure a spot at the World Tour finals with a 6-4, 6-1 first-round victory over American qualifier Michael Russell at the Valencia Open on Monday.
The French Open will be held in Paris from May 22 to June 5.
Mahesh Bhupathi and Rohan Bopanna have earned a chance to win their second title of the season by reaching the summit clash of the ATP Cincinnati Masters with a straight sets win over Croatia's Ivan Dodig and Brazil's Marcelo Melo.
Top seed James Blake cruised into the final of the US Clay Court Championship with a 6-3, 7-6 victory over Spaniard Oscar Hernandez on Saturday. In Sunday's final, Blake will face another Spaniard in Marcel Granollers-Pujol, who came from a set down to beat American Wayne Odesnik 3-6, 7-5, 6-3 in Saturday's first semi-final.
Andy Murray put away an off-colour Robin Soderling in the opening match of the ATP World Tour Finals in London on Sunday.
IMAGES from matches on Day 4 of the US Open at Flushing Meadows in New York on Thursday.
World No. 2 Novak Djokovic believes Andy Murray's wife Kim Sears deserves much credit for the British tennis star's recent success on the tennis court. The British tennis ace ended Djokovic's three-year reign at the top of the tennis world this month after defeating the Serb in straights in the summit clash of the ATP World Tour Finals. Murray dethroned Djokovic 6-3, 6-4 in a contest to earn his first title at the ATP finals and make sure he remained No. 1 until next season.
World No. 1 Novak Djokovic remained at the top of the rankings chart