Frances Tiafoe celebrated his 21st birthday by reaching the Australian Open quarter-finals with victory over former semi-finalist Grigor Dimitrov.
The unseeded American beat the Bulgarian 20th seed 7-5 7-6 (8-6) 6-7 (1-7) 7-5 to reach the last eight at a Grand Slam for the first time.
The world number 39 will play world number two Rafael Nadal, who beat former Wimbledon finalist Tomas Berdych 6-0 6-1 7-6 (7-4).
"It means the world," he said.
An emotional Tiafoe took a while to compose himself after his victory, pacing the court and shaking his head, while a rendition of "Happy Birthday" rang out from the stands.
His voice cracked during his on-court interview, saying he could not believe he was in the quarter-finals of a major tournament.
"I told my parents 10 years ago I was going to be a pro tennis player and change their life," said Tiafoe, the son of immigrants from Sierra Leone.
"I worked my ass off, man."
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