Australian Open 2019: Birthday boy Frances Tiafoe sets up quarter-final clash with Rafael Nadal after beating Grigor Dimitrov

Melbourne: An emotional Frances Tiafoe said Sunday he had already changed his parents' lives and now he was motivated to do the "same for me" ahead of a quarter-final with Rafael Nadal at the Australian Open.

The American celebrated his 21st birthday by beating 20th seed Grigor Dimitrov in four sets and then broke down as he revealed how he had supported his mother and father, who are both immigrants from Sierra Leone.

Tennis - Australian Open - Fourth Round - Melbourne Park, Melbourne, Australia, January 20, 2019. Frances Tiafoe of the U.S. celebrates winning the match against Bulgaria's Grigor Dimitrov. REUTERS/Aly Song - UP1EF1K0GV2YA

Frances Tiafoe celebrates after beating Grigor Dimitrov. Reuters/Aly Song

"It means the world," said a tearful Tiafoe, voice cracking, after stunning the Bulgarian 7-5, 7-6 (6), 6-7 (1), 7-5 in 3hr 39min.

"I worked my ass off, man. I told my parents 10 years ago I was gonna be a pro tennis player and change their life."

World No 39 Tiafoe described his unusual path to the last eight of a Grand Slam for the first time in his fledgeling career.

"Obviously I wasn't a normal tennis story," he told reporters. "The beginning of my career, I was playing for them, trying to do everything for my family."

He described how at the age of 19 he managed to turn around things for his struggling parents.

"In March 2017 I bought a house in Maryland for my mom. My dad is in an apartment in Orlando," he said of his janitor father.

"So, yeah, that was big. Getting us out of... you know, just put us in better situations. I was able to do stuff like that.

"Obviously I put them in a great place. Now I'm trying to do it for me."

The aggressive American upset the 20th seed in four high-quality sets that saw multiple breaks of serves and an avalanche of breathtaking winners.

"I would have been mad if I had lost on my birthday," he added.

Tiafoe was on the front foot from the start and took the first set after 52 minutes and marked it with a one-arm raised fist salute.

'He's going to run me'

The 27-year-old Dimitrov, once dubbed BabyFed because of his smooth backhand reminiscent of Roger Federer, blew three set points at 6-3 in a second set tiebreak.

Tiafoe took advantage and ripped a winner for a two-set cushion and then posed in admiration at his own work.

The third also went the distance. Dimitrov this time raced to 6-1 and got himself back in the match on his first set point.

A fourth attritional set ensued until at 5-5 Tiafoe, who played in the recent mixed teams Hopman Cup with Serena Williams, secured the decisive break and served out to set up the last-eight clash with Nadal on Tuesday.

After celebrating by ripping his shirt off, beating his chest and showing off his muscles, LeBron James-style, Tiafoe then seemed a bit embarrassed.

"I said I wasn't going to do that again," grimaced the young giant-killer, who knocked out fifth seed Kevin Anderson in the first round.

Tiafoe admitted that winning on his birthday meant he would have put celebrations on hold to prepare for the daunting prospect of facing the 17-time Spanish Grand Slam champion.

"I can't do anything tonight. He's going to run me like crazy," he said.

"I'd better go to bed now."

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Updated Date: Jan 20, 2019 16:38:29 IST

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