Australian teenager Alex De Minaur is one match away from advancing to the Brisbane International final, as his dream run continues on Pat Rafter Arena.
The 18-year-old De Minaur, a wildcard in Brisbane, beat American qualifier Michael Mmoh 6-4, 6-0 to move through to the semi-finals, where he will meet either Denis Istomin or Ryan Harrison.
De Minaur, ranked 208th in the world, had made the quarter-finals after defeating Milos Raonic, who has been ranked as high as number three, 6-4, 6-4 in a stunning upset on Wednesday night.
"There were a lot of nerves coming into this match, it was a big opportunity for me," De Minaur said.
"But I came in here a little more level headed, had more time to play, and was able to play my best tennis."
With Australia Davis Cup captain and mentor Lleyton Hewitt screaming encouragement courtside, De Minaur saved three break points in the sixth game to finally find his range and clinch the first set in 49 minutes with a booming forehand winner.
The second set became a blur and was over after just 25 minutes, as De Minaur dominated, thrashing 17 total winners to Mmoh's nine.
De Minaur also feasted on Mmoh's 26 unforced errors.
Kyrgios comes from behind to beat Dolgopolov
De Minaur was later joined in the last four by countryman Nick Kyrgios, who defeated Alexandr Dolgopolov in his quarter-final.
The Australian men's number one dug deep to move through to the semi-finals after a come-from-behind 1-6, 6-3, 6-4 victory over the Ukrainian.
World number 21 Kyrgios — ranked 17 spots higher than his opponent — looked lethargic early with his troublesome left knee strapped as former Brisbane finalist Dolgopolov broke twice to clinch the first set in 22 minutes.
But the dual grand slam quarter-finalist held his nerve to book a semi-final showdown with the winner of Friday night's clash between top seed Grigor Dimitrov of Bulgaria and Briton Kyle Edmund.