World number two Casper Ruud advanced to the quarter finals at the Korea Open in Seoul Seoul after battling through a tight round-of-16 match with the 111th-ranked Chilean, Nicolas Jarry, a qualifier.
Jarry, who quickly found himself trailing by a set, recovered to level the second round match against the top seed who was playing his opener following a bye, to force a decider.
There Ruud bounced back to take the third set to progress as expected, 6-2 3-6 6-3 after one hour and 43-minutes.
The 23-year-old Norwegian will now face in the last eight, Yoshihito Nishioka of Japan who comfortably put out his compatriot Taro Daniel 6-2 6-4.
Second seed Cameron Norrie, the British No.1, also advanced to the quarter finals with an equally comfortable 6-2 6-2 victory over Japanese wild-card Kaichi Uchida but can expect a tougher match when he faces American Jenson Brooksby, in the next round.
Another American, the third seed Taylor Fritz has been forced to withdraw with an illness.