World number 1 Andy Murray began his quest for a first ever ATP World Tour Finals win as he eased past Marin Cilic.

The Briton made quick work of Croatian Cilic, needing just 90 minutes to beat him 6-3, 6-2. Murray will face Kei Nishikori — who defeated Stan Wawrinka in his opening match — in the second round on Wednesday. His last group match will be on Friday against Wawrinka.

Murray said courtside: “It’s one of the best matches I’ve played here over the years. I’ll try to keep going to the end. Thank you for the incredible atmosphere here. I really appreciate it. I keep working hard and hope you enjoy it. When you start winning matches, you gain confidence. On break points I was a little bit more solid.”

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Murray will be hoping his fine form continues to the end of the tournament, as victory would mean he’d end the season as the World Number 1.

Nishikori, who also blasted past Wawrinka with ease, admitted it would be a much different challenge against Murray.

Nishikori said: “This year we played three, four times. I had a tough loss in Rio [at the Olympics]. But at the US Open and Davis Cup, we played two good matches. Obviously it’s the toughest match maybe in this group. I have to play 100% to beat Andy.”

Wawrinka on his part has already revealed his determination to improve ahead of the next group match with Cilic.

“I’m sure I still have something inside me to play some great tennis before the end of the year, so I’m going to try everything for that in the next match,” Wawrinka said. “I’m going to do what I need to do tomorrow to get ready for trying to play better in two days.”