Ashleigh Barty crashed out of the US Open in the fourth round as she suffered a straight-sets defeat to Wang Qiang at Flushing Meadows.
French Open champion Barty had the chance to set up a mouth-watering quarter-final clash against Serena Williams with victory at Louis Armstrong Stadium.
However, the second seed was well below her best in a 6-2 6-4 defeat marked by 39 unforced errors.
Wang, meanwhile, displayed impressive character in reaching her first grand slam quarter-final.
She saved four break points in a 10-minute game to hold for 5-3 in the second set and was required to hold off two more as she successfully served out the win in an hour and 22 minutes.
"I'm very focused on court, I just tried to hit aggressive," 18th seed Wang told ESPN on court afterwards.
Asked if she would be doing her homework by watching Williams' clash with Petra Martic, Wang said: "I think that's my coach's homework. I just want to enjoy now."