Harris beat the 6 foot 11 tall American 6-7, 6-4, 6-1 and 6-3 to make into the last eight of the US Open being played at Flushing Meadows in New York.

He also won 92% of his first serve points as he outclassed the American, who is known for his big service game.

Harris says his service game has given him a lot of confidence.

“What an unbelievable feeling this is.

“I thought I played a really good first set. Right from the start, I was returning well, getting on his serves, and throughout the match I served really well.

“After that first set not going my way, I just had to stay confident and kept on building.

“I think I can take a lot of positives out of that match.

 “I think I’ve been playing better and better as time has gone on.”

Harris has a tough quarter-final lined up against the world number four and Olympic champion, Alexander Zverev.

@MorganPiek OFM Sport