Frenchman Richard Gasquet reached his first grand slam semi-final in six years with a 6-3 6-1 4-6 2-6 6-3 upset win over Spain's David Ferrer at the US Open today.

Playing in just the second grand slam quarter-final of his career, eighth-seeded Gasquet used his trademark backhand to near perfection as he closed out fourth-seed Ferrer in three hours and 23 minutes at Flushing Meadows.

"I thought he was a little bit nervous in the wind, so I played on that," said Gasquet.

"I was a little bit tired but the last game was amazing for me. It's wonderful for me to be in the semis. It means a lot."

Gasquet will play either second-seed Rafa Nadal for a place in Monday's final.