Ons Jabeur gets the edge over Tomljanovic to reach US Open last four

Tomljanovic survived tennis' biggest spotlight when she beat Serena Williams (40) in a packed, third-round prime time affair on Friday but could not keep up in the quarter-final after Jabeur sent over three aces and 15 winners in the first set.

The Wimbledon finalist has a well-earned reputation as Tunisia's 'Minister of Happiness' but found her own good cheer tested as the unforced errors piled up in the second set and she threw her racket several times.

Although she broke Tomljanovic in the opening game of the second set, her grip on the match began to waver as her serve deteriorated and the Australian converted three of four break point opportunities.

"I think I'm going to be fired here from my job, 'Minister of Happiness'," Jabeur joked in an on-court interview.

"Tennis is a tough sport and I apologise for my behaviour... but the racket kept slipping away from my hand."

Tomljanovic handed Jabeur a break with a double fault in the ninth game and whacked the ball into the net on the final point of the tiebreak as the stone-faced Tunisian pumped her fist in a subdued celebration.

"It was kind of tough to kind of manage the frustration," Jabeur said. "She keeps fighting and she makes it tough for me."

Catch up with all the results from the US Open as they happen with Flashscore.