Andy Murray pushed all the way in longest ATP World Tour Finals match of all time by Kei Nishikori

LONDON // Andy Murray moved a step closer to the ATP World Tour Finals title as he wore down Kei Nishikori in a gruelling 6-7, 6-4, 6-4 victory that took over three hours on Wednesday.

The world No 1 was pushed to his limits by Nishikori in the longest Tour Finals match played in the event’s seven years at London’s O2 Arena.

But Murray finally subdued the Japanese in three hours and 20 minutes and will be guaranteed a place in the last four if Marin Cilic defeats Stan Wawrinka.

“I just fought really hard. Kei was making me run but I eventually got over the line,” Murray said. “These are the sort of matches you work so hard for. I feel OK right now, but it’s the following day when you feel it often.

“Hopefully there will be another three days to this season and I’ll do my best to get through them.”

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Murray’s gritty recovery took his winning streak to 21 matches, just one short of his career best run of 22 successive victories earlier this year.

It is the first time Murray, 29, has started the Finals with two consecutive group stage wins since his tournament debut in Shanghai in 2008.

Murray’s refusal to be outlasted by the obdurate Nishikori keeps him on course to retain top spot in the ATP rankings at the end of the year.

Novak Djokovic’s win over Milos Raonic on Tuesday had given the Serb a 70-point lead over Murray in the unofficial rankings but, with each victory at the Finals worth 200 points, the Scot moved back above his rival by beating Nishikori.

To guarantee finishing 2016 at the summit, Murray must win the Tour Finals for the first time, with anything less giving Djokovic the chance to overhaul him.

Murray had won seven of his nine meetings with Nishikori, but the world No 5 enjoyed an impressive triumph in their last encounter in the US Open quarter-finals and he made the Scot sweat again.

Murray was involved in the previous longest Tour Finals match, a 2010 semi-final loss to Rafael Nadal that took three hours and 11 minutes, and this time his overtime was not in vain.

When Nishikori earned a third break point at 5-5 in the first set, Murray again wriggled out of trouble but squandered a set point in the next game.

In a thrilling tie-break, Murray came from 6-3 down and saved four set points but crucially he was unable to take two set points of his own and Nishikori finally sealed it when the Scot missed a wild forehand.

In the second set Nishikori stayed level until 4-4, only for Murray to break again and close out the set.

In the decider, Murray broke twice, yet Nishikori did not go quietly and he got one break back before the Scot, at last, aced one of his most demanding tests this year.

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