Eighth seed Kei Nishikori completes his fourth comeback from two-sets-to-love down on Monday at the Australian Open.

Kei Nishikori fought through two five-setters to begin the Australian Open.

Kei Nishikori survives another five-setter in Melbourne.

Kei Nishikori looks to reach his second Grand Slam final at the Australian Open this fortnight.

Kei Nishikori returns to the Australian Open with a win.

Kei Nishikori advances after falling behind two sets to love on Tuesday in Melbourne.

Japanese football star Keisuke Honda meets Kei Nishikori during a practice session at the Australian Open.

Kei Nishikori improves to 12-14 in tour-level finals after beating Daniil Medvedev to win the Brisbane International on Sunday.

Kei Nishikori defeats Daniil Medvedev in three sets to win the Brisbane International on Sunday.

Kei Nishikori beats jeremy Chardy to advance to his second Brisbane International final.

Kei Nishikori avenges his 2017 Brisbane final loss to Grigor Dimitrov on Thursday for a place in the semi-finals.

Rafael Nadal, Jo-Wilfried Tsonga, Andy Murray, Kei Nishikori and Nick Kyrgios will kick off the 2019 season in Brisbane.

Jo-Wilfried Tsonga, Rafael Nadal, Andy Murray, Nick Kyrgios and Kei Nishikori seek one of three ATP 250 trophies up for grabs in the season's first week.

Kei Nishikori celebrates his 29th birthday after receiving a cake during his press conference at the Brisbane International on Saturday.

Kei Nishikori fans cheer on the Japanese star during his match against Dominic Thiem on Thursday at the Nitto ATP Finals in London.

The eight singles players competing at the Nitto ATP Finals take the Jubilee line on the London Underground from North Greenwich station to Westminster station to attend the Nitto ATP Finals Official Launch presented by Moët & Chandon at London's iconic Houses of Parliament on November 9, 2018 in London, England. The tournament will be played 11-18 November at The O2.

The eight singles players competing at the Nitto ATP Finals take the Jubilee line on the London Underground from North Greenwich station to Westminster station to attend the Nitto ATP Finals Official Launch presented by Moët & Chandon at London's iconic Houses of Parliament on November 9, 2018 in London, England. The tournament will be played 11-18 November at The O2.

The elite eight have arrived in London for the Nitto ATP Finals.

Kei Nishikori practises Friday with Alexander Zverev in preparation for the start of the Nitto ATP Finals on Sunday.

Four days after losing to Kevin Anderson in the Vienna final, Kei Nishikori beats Anderson in the third round in Paris.

Tenth seed Kei Nishikori battles past Adrian Mannarino on Wednesday for a place in the Paris third round.

Kei Nishikori earns his 40th tour-level match win of the season by defeating Mikhail Kukushkin on Saturday in Vienna.

Kei Nishikori defeats Mikhail Kukushkin in straight sets at the Erste Bank Open 500 on Saturday.

Kei Nishikori moves up to ninth position in the ATP Race To London after beating fellow Nitto ATP Finals contender Dominic Thiem on Friday in Vienna.

Kei Nishikori makes light work of Karen Khachanov on Thursday in the Vienna second round.