Defending champion Andy Murray survived a scare to reach the quarter-finals with a 6-0, 6-7, 6-4 win over Dane Kristian Pless.
Rohan Bopanna and Florin Mergea saved a match-point before emerging winners, while Sania Mirza and Martin Hingis were also tested en route to the quarter-finals of the ATP/WTA Western and Southern Open, in Cincinnati, on Thursday.
Teenager Kei Nishikori became the first Japanese to reach an ATP final at the Delray Beach International.
Australian maverick Nick Kyrgios blazed past Feliciano Lopez with a barrage of aces to reach the semi-finals of the ATP 500 Fever-Tree championships at Queen's Club on Friday. The 23-year-old was in dazzling form as he claimed a 7-6(5), 7-6(3) victory over the defending champion to set up a clash with top seed Marin Cilic, who breezed past Sam Querrey.
The American teenager beat compatriot Paul Goldstein in the San Jose Open first round on Monday.
Donald Young has replaced the injured John Isner for the United States and will face Wimbledon champion Andy Murray of Britain in Friday's opening match of the first-round Davis Cup tie in San Diego.
Murky skies and drizzle could not dampen the enthusiasm of spectators arriving on Monday
World No 1 Novak Djokovic and defending champion Andy Murray produced contrasting performances to secure their berths in the quarter-finals of the Madrid Masters on Thursday.
Johanna Konta hopes fellow Briton Andy Murray will be in action at this year's Wimbledon despite media reports claiming that the Scot has suffered a setback in his recovery from hip surgery.
Aryna Sabalenka of Belarus and Paula Badosa of Spain, earned second-round wins
Defending champion Djokovic fired his 15th ace on match point to defeat Querrey but his serve had been an issue earlier in their second-round encounter.
The Swiss squandered seven set points in the opener and although he took the second on a tiebreak he capitulated in the decider after dropping serve at 1-2, losing 7-5, 6-7(3), 6-1.
'I would say winning the US Open has helped me for all these grand slams I have played so far, and I believe the rest of my career' 'It's great for me to hear that even he, and a lot of players around, even ex-players, when they were looking before the tournament started, that they were seeing me as a player that could go quite deep (into the tournament)'
Prakash Amritraj began his campaign at the Hall of Fame Tennis Championships with an easy straight sets win over Flavio Cipolla, in Newport.
So Djokovic will certainly not be letting his guard slip when he plays American Denis Kudla on Friday.
Images from all the action on Day 5 of the Australian Open
Kevin Anderson spoiled the American party at the US Open when the big-serving South African beat local favourite Sam Querrey 7-6(5), 6-7(9), 6-3, 7-6(7) to reach his first Grand Slam semi-final on Tuesday.
World number one Novak Djokovic has disclosed that his sudden slump in form was due to ' private issues' and not because of a lingering wrist injury.
Wimbledon champion Andy Murray says he is unlikely to play in Britain's Davis Cup quarter-final clash in Serbia this weekend but could travel to Belgrade in support of the team.
Sania and her Chinese Taipei partner Su-Wei Hsieh, seeded second, defeated the Argentine-Swiss combine of Maria Irigoyen and Romina Oprandi 6-2, 6-0 in 48 minutes, while tenth seeds Paes and Raven Klaasen of South Africa beat the American duo of Scott Lipsky and Rajeev Ram 6-4, 7-6(6).
Somdev Devvarman put up a strong fight before going down to world No 31 Fernando Verdasco, while Mahesh Bhupathi lost in the first round at the ATP China Open, in Beijing, on Thursday.
Rafael Nadal continued to scythe his way through the Shanghai Masters on Thursday, reaching the quarter-finals with a 6-3, 6-1 thrashing of temperamental Italian Fabio Fognini.
Tenth-seeded Keys, who reached the third round with a 6-4, 6-3 victory over Luksika Kumkhum of Thailand, is one of the biggest servers on the women's circuit.
Leander Paes will kickstart his US Open campaign with Czech partner Radek Stepanek against Jarkko Nieminen of Finland and Dmitry Tursunov of Russia.
In last year's quarter-finals at the All England Club, Federer saved three match points before edging out Cilic in five sets and the closeness of that match is comforting for the Croat.
Seven-time champion Federer faces last year's runner-up Milos Raonic in his quarter-final on Wednesday after defending champion Murray, who is chasing a third SW19 title, takes on big-serving American Sam Querrey for a place in the last four.
Top seed Kei Nishikori of Japan became the first player to win three consecutive Memphis Open tennis tournament titles when he prevailed in straight sets on Sunday.
Here is a timeline of Djokovic's decline since the last of his 12 Grand Slam titles.
Cilic marches past Querrey into Queen's semis
Raducanu stormed into the third round of the Cincinnati Open
Wimbledon finalists Novak Djokovic and Roger Federer are on a semi-final collision course at the US Open after they were placed in the same half of the draw.
Goffin's 6-3, 6-3, 6-2 triumph in front of a boisterous home crowd gave Belgium a 3-1 lead and sent them into a home semi-final against Australia who also wrapped up victory over the United States thanks to Nick Kyrgios's defeat of Sam Querrey.
Manchester City and Everton players took to the field wearing Ukrainian flags before their Premier League game on Saturday while there were anti-war messages at stadiums elsewhere following Russia's invasion of Ukraine.
Top seed Kei Nishikori is on track for a three-peat at the Memphis Open after a narrow semi-final victory on Saturday.
The French flag flew proudly in Montreal on Monday as Gilles Simon and Gael Monfils advanced to the second round of the Rogers Cup.
Soon after he won his historic US Open title, Paes said more than technique it is his never-say-die spirit that has got him success.
The Wimbledon Championship runner-up is expected to be a top draw at the ATP 250 event to be played at the Mhalunge Balewadi Stadium in Pune.
World No 5 Roger Federer's possible records aside, it is the first time since 2003 that the semis have featured four men outside the top four in the world rankings.
Novak Djokovic was given a scare in his North American hardcourt season opener but managed to prevail with a 7-5, 7-6(3) victory over Luxembourg's Gilles Mueller on Wednesday to reach the third round of the Rogers Cup.
News of all that's transpired on and off the tennis courts
