Carlos Alcaraz sets up Cincinnati quarter-final against Cameron Norrie

The Spanish teenager is yet to drop a set in Cincinnati.

Alcaraz had a chance to serve out the opening set at 5-4, but Cilic rallied to break back and eventually force a tiebreaker.

The 19-year-old sensation raced to a 5-1 lead and never looked back, taking the momentum into the second set which he wrapped up in 34 minutes.

"I know that Marin is a really aggressive player," the world number three told the press after his victory, as per atptour.com.

"I had to be really focused on the match. I knew that it was going to be a tough match, that I had to be [mentally] in the match all the time. I knew that I was going to have my chances to break his big serve.

"So I'm really happy with the performance and the focus in the match."

TOO GOOD ð¤¯â¡ï¸@carlosalcaraz | @CincyTennis | #CincyTennis pic.twitter.com/FnVOaHxG2A

Elsewhere, seventh seed Filipe Auger-Aliassime came back from a set down to defeat 10th seed Jannick Sinner of Italy 2-6, 7-6, 6-1.

The young Canadian faces Borna Coric - who knocked out Rafael Nadal earlier in the tournament - in his last eight clash on Saturday.

Charging on@cam_norrie sweeps past Shelton 6-0, 6-2#CincyTennis pic.twitter.com/St62UK4lKx