Serena Williams has time “working for her” in pursuit of an elusive 24th Grand Slam singles title, says her long-time coach Patrick Mouratoglou.

The former world No 1, who will turn 38 later this month, suffered her fourth successive defeat in a major final at the US Open earlier this month as her wait to match Australian Margaret Court’s all-time haul was prolonged.

Williams will now have to wait until the Australian Open – the scene of her last Grand Slam title in 2017 – in January for her next shot at history.

Williams lost one set on her way to the US Open final earlier this month Williams lost one set on her way to the US Open final earlier this month Williams lost one set on her way to the US Open final earlier this month

After her defeat to Canadian teenager Bianca Andreescu at Flushing Meadows, the world No 9 resisted fears over her ability to overcome one final obstacle in her career: to match and then overhaul Court’s tally.

Mouratoglou, who has coached Williams to 10 Grand Slam titles since beginning their partnership in June 2012, insists the American is becoming ever more formidable.

“I think time is working for her,” Mouratoglou told Sky Sports‘ Mathieu Wood in an exclusive interview at the Mouratoglou Academy.

“I think she was much better at the US Open than she was at Wimbledon and Wimbledon better than Roland Garros.

Patrick Mouratoglou (centre) has coached Williams for the past seven years Patrick Mouratoglou (centre) has coached Williams for the past seven years Patrick Mouratoglou (centre) has coached Williams for the past seven years

“She is getting back in shape and the more in shape she will be the more dangerous she will be. I think she has started to play really good tennis.”

Williams has not won a set in any of the four Grand Slam finals she has reached since the return from the birth of her first child in September 2017.