Frances Tiafoe is the first American man to make a US Open semi-final since Andy Roddick in 2006.
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.
Russia's invasion of Ukraine was condemned by the sporting community on Thursday, with President Vladimir Putin's country losing hosting rights for the UEFA Champions League final while Formula One drivers said it was "wrong" to race there this year.
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.
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 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.
The German picked up two ATP titles in Cologne and also made the final of the ATP Masters 1000 event in Paris in an encouraging close to the season.
Next up for the 35-year-old will be another American in 39th-ranked Tommy Paul with a potential semi-final clash against top-seeded Russian Daniil Medvedev, who he defeated in the Australian Open final from a two-sets deficit.
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.
German fourth seed Alexander Zverev beat Spaniard Pablo Carreno Busta 7-6(4) 6-2 on Friday to set up a Miami Open final showdown against big-serving American John Isner, who earlier overwhelmed Juan Martin del Potro.
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.
Djokovic said the Spaniard remains his biggest rival.
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.
A round-up of all tennis action on Friday.
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.
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.
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.
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.
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.
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.
Mardy Fish beat Ivo Karlovic 7-6, 6-4 to reach the final of the ATP event in New Haven.
Andy Murray put away an off-colour Robin Soderling in the opening match of the ATP World Tour Finals in London on Sunday.
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.
The Serb easily beat the Spaniard 6-3, 6-4 at the O2 Arena.
Kyrgios added that he had been in communication with Tennis Australia chief executive Craig Tiley and United Cup tournament director Stephen Farrow about his injury.
Swede Robin Soderling claimed his second major upset at the ATP World Tour Finals on Wednesday when he beat world number three Novak Djokovic 7-6, 6-1.
Rafa Nadal was eliminated from the ATP World Tour Finals, on Thursday, after being outgunned by an inspired Jo-Wilfried Tsonga in an absorbing late-night battle at the O2 Arena, in London.
The Indian duo of Mahesh Bhupathi and Rohan Bopanna has set up a summit clash with Leander Paes and his Czech partner Radek Stepanek after both the pairs won their respective semi-final matches in the Shanghai Masters on Saturday.
The Indo-Pakistan duo will take on third seeds Jarkko Nieminen of Finland and Robert Lindstedt in the championship round.
Rohan Bopanna and Andre Begemann suffered a quarter-final exit from the ATP Citi Open after a close defeat against Treat Huey and Dominic Inglot in Washington.
Spain's Fernando Verdasco and David Marrero, the sixth seeds, upset the favourites 7-5, 6-7(3), 10-7 as the title went to a Spanish pair for the second successive year following the triumph of Marcel Granollers and Mark Lopez 12 months ago.
Having Lendl, as I said, can only serve him as an incentive for an improvement, says Djokovic
Crowd favourite John Isner advanced to his second career ATP Tour final on Friday with an 6-2, 7-6 victory over Spanish eighth seed Albert Montanes.
Top seeds Leander Paes and Lukas Dlouhy on Friday earned a shot at the title of the season opener ATP Brisbane International event after overcoming a second set lapse against Jurgen Melzer and Philipp Petzschner in Brisbane.
A doubles title continued to elude Mahesh Bhupathi and Max Mirnyi as they lost the Valencia Open final to British brothers Andy and Jamie Murray in Valencia.
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 world number one swept aside Spain's David Ferrer in the Nasdaq-100 Open semi-final and set up a clash with Ivan Ljubicic.
Nikolay Davydenko ended seven years of pain against Roger Federer on Saturday, beating the world number one 6-2, 4-6, 7-5 to reach the final of the ATP World Tour Finals for a second successive year.