Novak Djokovic of Serbia plays a shot during  his fourth round match against Daniil Medvedev. Photograph: Scott Barbour/Getty Images

If the guard is changing at the summit of tennis, it is doing so slowly and without conviction, as Novak Djokovic steps into the void left by the depa(...)

 Aliaksandra Sasnovich of Belarus returns to Petra Kvitova of the Czech Republic in their first-round match at  Wimbledon. Photograph: Nic Bothma/EPA

Two-time champion Petra Kvitova slumped out of Wimbledon in the first round on Tuesday, beaten by inspired world number 50 Aliaksandra Sasnovich of Be(...)

 Australia’s Nick Kyrgios prepares to serve against Bulgaria’s Grigor Dimitrov during their men’s singles fourth round match at the  Australian Open in Melbourne. Photograph: Saeed Khan/AFP/Getty

For all the talk of a rebooted, matured Nick Kyrgios, Sunday night’s match with the world number three Grigor Dimitrov saw the Australian decisively l(...)

Nick Kyrgios of Australia and Grigor Dimitrov of Bulgaria embrace after their fourth round match at the Australian Open. Photo: Darrian Traynor/Getty Images

Nick Kyrgios told Grigor Dimitrov to believe he can win the Australian Open after the Bulgarian came out on top of a fierce battle under the lights on(...)

Rafael Nadal beat Juan Martin del Potro in straight sets to reach the US Open final. Photograph: Jewel Samad/AFP

Rafael Nadal defeated a weary Juan Martin del Potro to set up a US Open final against Kevin Anderson. After upsetting Roger Federer to prevent a firs(...)

 Pablo Carreno Busta of Spain celebrates his win against Denis Shapovalov. Photograph: Shannon Stapleton/Reuters

Denis Shapovalov vowed to return to New York and “do some damage” after his US Open adventure ended in a fourth-round defeat by Pablo Carreno Busta. (...)

Diego Schwartzman celebrates his four set victory over Marin Cilic. Photograph: Richard Heathcote/Getty

The US Open men’s draw is a land of opportunity for a host of unfancied names after Marin Cilic became the latest favourite to crash out. Andy Murray(...)

Austria’s  Dominic Thiem of Austria plays a backhand during his  men’s singles quarter-final against Novak Djokovic  at Roland Garros  in Paris. Photograph: Adam Pretty/Getty Images

Austria’s Dominic Thiem stunned defending champion Novak Djokovic to set up a French Open semi-final against Rafael Nadal. Thiem showed why he is on(...)

Juan Martin del Potro eased past David Ferrer in straight sets to reach the US Open last-16. Photograph: Getty

Juan Martin del Potro is as surprised as anyone that he has reached the US Open last 16. Del Potro cruised past Spain’s David Ferrer 7-6 (7-3) 6-2 6-(...)

Scotland’s Andy Murray  chases a return against Paolo Lorenzi of Italy during their match at the   US Open. Photograph:   Eduardo Munoz Alvarez/AFP/Getty Images

Flummoxed and frustrated by wily veteran Paolo Lorenzi for two sets, second seed Andy Murray changed tactics and beat the 34-year-old Italian at his o(...)