LONDON, United Kingdom — Novak Djokovic insists reaching the elite 800-win club is only the latest milestone in his quest to rewrite the record books, refusing even to rule out playing beyond his 40th birthday.

Djokovic became only the 10th man in the Open era to reach 800 match wins as the former world number one moved into the Queen’s Club semi-finals with a 7-5, 6-1 victory over Adrian Mannarino on Friday.

The 31-year-old will play France’s Jeremy Chardy — a 6-4, 6-4 winner over American youngster Frances Tiafoe — on Saturday as he bids for a second Queen’s final appearance.

If Djokovic wins the semifinal and goes onto take the Queen’s title for the first time, he will pass Stefan Edberg into ninth place on the all-time wins list.

Jimmy Connors is on top with 1,256 wins ahead of second placed Roger Federer, who has 1,156.

With Federer still going strong at age 36, Djokovic sees no reason why he can’t enjoy similar longevity to the Swiss star, even joking that he could play into his 50s.

For now, the 31-year-old would be satisfied with keeping fit enough to have a shot at reaching the 900-win mark which only Connors, Federer, Ivan Lendl, Guillermo Vilas and Rafael Nadal have surpassed.

Asked how long he can play for, Djokovic grinned, saying: “Who said 40? I said 50! So it’s 19 years (left in his career). I have plenty of time to make a couple more wins.