Raducanu reached this stage after taking a 6-3, 7-5 win over Belgium’s Yanina Wickmayer on Thursday morning.
The British number 1 and sixth seed, plagued with injuries, is determined to make progress here in Seoul after failing to defend her grand slam title in New York and a second-round defeat at the Slovenia Open from last week.
“My goal on the field is to keep swinging more and more freely in every game. And my other goal is to stay in Korea as long as possible,” she said.
“Last week I struggled a bit with my legs, I just did a lot of training, and like I said, the rest of this year is just really trying to build up physically for the next year.
“So I’m training a lot – like before the game today I did 90 minutes on the pitch and I’m just trying to get myself in shape.
“And that sometimes comes with little niggles. Right now it’s something I’m just managing, but I know it’s for a bigger benefit, so I’ve been digging into that process.”