It’s no small achievement to win a Grand Slam, and only a select few in the sport’s history have ever done it.

While players like Novak Djokovic, Roger Federer and Rafael Nadal made it look easy at times, for most, it remained an unattainable goal.

Tomas Berdych, Jo-Wilfried Tsonga and David Ferrer all came close but fell just short of the ultimate prize.

But according to Patrick Mouratoglou, who once coached Serena Williams, there’s one player who stands out above the rest as the best to never lift a Grand Slam trophy.

Patrick Mouratoglou names his four greatest players never to win a major

Speaking on Instagram, Mouratoglou shared his thoughts: “I have a top four, which is the four guys that were so close [to] winning a Grand Slam because at their peak they should have, but they just missed the opportunity.”

“So first Marcelo Rios. He had his chance at the Australian Open against [Petr] Korda. Korda won that match. I think it was the thing that affected his career.

“The second I would name [Guillermo] Coria. At the peak of his career he played this final of Roland Garros when he was leading two sets to love against Gaudio and he ended up losing it because of the nerves.

“Coria was most of all an incredible clay court player and this final of Roland Garros for him was something that really destroyed his career.

Zverev’s near-misses came during a rare gap between two eras of dominance in men’s tennis. He lost both finals – one against Dominic Thiem and another to Carlos Alcaraz before either had fully established themselves as champions.

Nalbandian rounds out Mouratoglou’s list. The Argentinian reached at least the semifinals in all four majors, including a run to the Wimbledon final where he fell short against Lleyton Hewitt.

Mouratoglou added: “When he was playing his level, a lot of times he was able to beat Roger and Rafa at their peak.”

David Nalbandian’s one appearance in a Grand Slam final

David Nalbandian hit the high point of his career in 2002, making it all the way to the Wimbledon final.

During that tournament, he had an impressive run but came up against top-seeded Lleyton Hewitt in the final.

Nalbandian lost in straight sets, with Hewitt taking the match 6-1, 6-3, 6-2 on Centre Court.

After that, he made it back to semi-finals at Grand Slams several times but never reached another final. His last deep run came at Roland Garros in 2006.