Croatia, Serbia and Austria sealed places in the Davis Cup quarter-finals on Sunday after converting 2-1 overnight leads into winning margins.
Fourth seed Jo-Wilfried Tsonga suffered an unexpected defeat in his opening match at the Shanghai Masters on Wednesday when he was beaten 6-7, 6-4, 6-4 by Japanese Kei Nishikori.
Defending champion Andy Murray blew out the cobwebs with a 7-6, 6-4 win over towering Croat Ivo Karlovic on Tuesday in his first match since winning last month's U.S. Open.
Leander Paes and his Czech partner Radek Stepanek's campaign in the BNP Paribas Open came to an end after they lost 6-3, 7-6(5) to Spain's Rafael Nadal and Marc Lopez at Indian Wells on Wednesday.
Naomi Osaka eased into the second round of the Italian Open on Monday with a 6-0, 6-3 victory over former world number one Victoria Azarenka, on a day in which local favourite Roberta Vinci called time on her career.
The Spaniard's main rival, Roger Federer, picked the Stefan Edberg Sportsmanship prize for a record fifth successive year.
Vishnu Vardhan made an impressive Davis Cup debut but lost the must-win first reverse singles of the play-off tie to Kei Nishikori in Tokyo on Sunday. The result relegated India to Asia/Oceania Zone Group I and catapulted Japan to World Group for the first time since 1985.
Davis Cup captain S P Misra says he did not expect India would be trailing 0-2 at the end of the opening day in their World Group play-off tie against Japan, on Friday. India's biggest hope Somdev Devvarman suffered a surprise straight-set defeat to Yuichi Sugita, and then Rohan Bopanna met the same fate at the hands of Kei Nishikori.
American wild card Ryan Sweeting completed his unlikely tournament run by capturing the US Clay Court Championship with a 6-4, 7-6 victory over Japan's Kei Nishikori on Sunday.
Sixth seed semi-finalist Janko Tipsarevic advanced into the last eight of the Chennai Open with a comfortable 6-2, 7-6 (3) win over Russian Alexandre Kudryavtsev on Thursday.
Making an impressive start at the ATP Malaysian Open, Indian teen Yuki Bhambri demolished fellow wild card Yew-ming SI of Malaysia 6-2, 6-0 in the first round in Kuala Lumpur on Monday.
Novak Djokovic eased into the last four with a commanding performance over Japan's Kei Nishikori but world number two Daniil Medvedev bowed out of the men's singles at the Tokyo Olympics.
Shunning all the injury worries, India's Rohan Bopanna will play the opening match against Japan's No 1 player Kei Nishikori in the Asia-Oceania Davis Cup tie, in New Delhi, from April 11 to 13. India's top player Prakash Amritraj will take on Go Soeda in the second singles, after the visitors went with the rankings and left out their most experienced Davis Cupper Takao Suzuki from the singles line-up.
Country's highest ranked singles player Rohan Bopanna trails his Japanese counterpart Kei Nishikori by more than 200 rungs but India's Davis Cup captain Leander Paes is confident the hosts will put up a brave fight in the upcoming Asia-Oceania Group-I tie starting in New Delhi on April 11.
Lleyton Hewitt proved he is not quite ready to hand over the baton in Australian men's tennis as he used all his years of grasscourt know-how to beat 21-year-old Japanese Kei Nishikori in four sets on Tuesday.
World number seven David Nalbandian stayed on course for his first Stockholm Open title by crushing Spaniard Albert Montanes 6-4, 6-1 in the quarter-finals on Friday. The top seed from Argentina broke serve once in the opening set and three times in the second to set up a meeting with third-seeded Finn Jarkko Nieminen, who ousted Spain's Oscar Hernandez 6-1, 6-4.
Indian captain Leander Paes went down in a close contest against Satoshi Iwabuchi, while Mahesh Bhupathi surrendered tamely against Kei Nishikori as Japan closed the margin to 2-3 in the Asia Oceania Davis Cup round II tie in New Delhi on Sunday. Paes lost 4-6, 6-4, 4-6 to the left-handed Iwabuchi in a dramatic fifth rubber after Bhupathi had folded to a 5-7, 1-6 defeat against Japan's no.1 Nishikori.
Rafael Nadal set up an Italian Open semi-final with Stefanos Tsitsipas on Friday thanks to a 6-4, 6-0 win over Fernando Verdasco.
Rafael Nadal looked like he had never been away as he made a welcome return to Wimbledon with a ruthless 6-2, 6-4, 6-4 win over Japanese wildcard Kei Nishikori on Tuesday.
Rafael Nadal looked like he had never been away as he made a welcome return to Wimbledon with a ruthless 6-2, 6-4, 6-4 win over Japanese wildcard Kei Nishikori on Tuesday.
Dancevic shocked top seed Andy Roddick while Tursunov beat American Sam Querrey in the semi-finals of the Indianapolis championships.
Novak Djokovic handed Kei Nishikori a brutal lesson in hardcourt tennis as the Serb began his bid for a record fourth successive title at the ATP World Tour Finals with a 6-1, 6-1 win on Sunday.
Defending US Open champion Rafael Nadal retired from his semi-final against Argentine third seed Juan Martin del Potro on Friday with right knee issues. The world number one was trailing 7-6(3), 6-2 when he decided to call it a night.
The Italian is the youngest winner on the men's tour since Japan's Kei Nishikori won the Delray Beach Open at the age of 18 in 2008.
With the Australian Open currently on, defending champion Novak Djokovic has once again been dubbed as a favourite to retain the title, and former world No. 17 Bernard Tomic of Australia firmly believes there will be no one to challenge the great Serbian.
After booking a much-anticipated semi-final with his Australian Open title usurper Stan Wawrinka on Wednesday, Novak Djokovic wasted little time reminding the Swiss of the heavy burden of being defending champion.
Will it be Rafa versus Djoko in Sunday's final?
The US-based Indian player advanced into the final round of the US Open qualifiers on Thursday.
Grit, determination, nerves were all on show at the US Open final.
"You can't think that (Kei) Nishikori, Dominic Thiem or Marin Cilic have a chance," the former French Open champion said.
In his pre-tournament news conference in Toronto on Sunday, Nadal said a recurring foot issue he has been dealing with since 2005 returned at the French Open, where he fell to eventual champion Djokovic in the semi-finals.
Andy Murray reached the final of the Madrid Open for the second year running by beating Rafael Nadal in straight sets 7-5, 6-4 on Saturday.
Home hope Bernard Tomic continued his promising form ahead of the Australian Open by overcoming Kei Nishikori to set up a Brisbane International semi-final against big-serving Canadian Milos Raonic.
With a crop of talented young players knocking on the door of the exclusive men's Grand Slam club, the 'Big Four' hegemony over the game's top tournaments may be coming to a close.
Marin Cilic completed a sensational set of semi-final shockers by upsetting 17-times Grand Slam winner Roger Federer 6-3, 6-4, 6-4 on Saturday to reach the final of the US Open. Croatian 14th seed Cilic's opponent in Monday's final will be 10th seed Kei Nishikori of Japan, who sent world number one Novak Djokovic out of Flushing Meadows with a stunning 6-4, 1-6, 7-6(4), 6-3 victory.
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.
The Austrian spent four days in bed with a virus after pulling out of a tournament in Doha last week.
IMAGES from Day 5 of the Australian Open in Melbourne, on Friday.
Canada's Milos Raonic has withdrawn from the ATP Tour Finals in London due to injury and been replaced by Spain's David Ferrer.
Roger Federer, who will be chasing an 18th Grand Slam title at the Australian Open later this month, breezed through to the Brisbane International men's semi-finals with a 6-1, 6-1 thumping of Australian Marinko Matosevic.