Former finalist Kei Nishikori advances to the second round at the US Open.

Kei Nishikori's more aggressive approach has paid off at Wimbledon.

Eighth seed Kei Nishikori overcomes a slow start to beat Steve Johnson on Saturday at Wimbledon.

Eighth seed Kei Nishikori comes through a slow start to beat Cameron Norrie on Centre Court at Wimbledon on Thursday.

Eighth seed Kei Nishikori strikes 36 winners - seven on his backhand - to beat Thiago Monteiro on Tuesday at Wimbledon.

Kei Nishikori spent 15 hours on court in his five matches at Roland Garros, which ended in a loss to Rafael Nadal.

Kei Nishikori has never reached beyond the quarter-finals at Roland Garros.

Seventh seed Kei Nishikori has broken serve six times through three sets against Benoit Paire.

Kei Nishikori reaches the fourth round at Roland Garros for the fifth consecutive year.

Seventh seed Kei Nishikori bounced back from deficits in the third and fourth sets against Jo-Wilfried Tsonga on Wednesday at Roland Garros.

Kei Nishikori reaches the second round at Roland Garros for the fifth consecutive year.

Sixth seed Kei Nishikori will play American Taylor Fritz or Argentine Guido Pella in the second round in Rome.

Juan Martin del Potro and Kei Nishikori congratulate Jamie Murray and Bruno Soares on their win in the second round of the Mutua Madrid Open.

Juan Martin del Potro and Kei Nishikori win their team debut on Monday in Madrid.

Two-time Barcelona champion Kei Nishikori advances to the semi-finals without dropping a set.

Kei Nishikori, the 2014 and 2015 Barcelona champion, records his 20th victory at the tournament on Tuesday over Taylor Fritz.

Kei Nishikori lends a hand during Miami Unites Day at the Miami Open presented by Itau.

Kei Nishikori moves to 2-0 in his FedEx ATP Head2Head series with Adrian Mannarino on Sunday in Indian Wells.

Kei Nishikori defeats Benoit Paire at the Dubai Duty Free Tennis Championships on Tuesday.

Kei Nishikori will meet Benoit Paire in the first round of the Dubai Duty Free Tennis Championships.

Japan's Kei Nishikori routs Ernests Gulbis to reach the quarter-finals in Rotterdam.

Kei Nishikori will meet Ernests Gulbis in the ABN AMRO World Tennis Tournament second round.

Kei Nishikori defeats Pierre-Hugues Herbert in three sets at the ABN AMRO World Tennis Tournament on Tuesday.

Top seed Kei Nishikori will meet Open Sud de France runner-up Pierre-Hugues Herbert in the ABN AMRO World Tennis Tournament first round.