Ons Jabeur advanced through to her first US Open semi-final after defeating the in-form Ajla Tomljanovic 6-4 7-6 (7-4) on Tuesday.
Jabeur, the world number five, became the first woman from Africa to make the last four at Flushing Meadows after a powerful display in the quarter-finals accounted for an opponent who has belatedly started to pose problems at grand slams.
Continuing a strong season of her own, in which she played a first major final at Wimbledon, Jabeur broke twice in the opening set as Tomljanovic failed to fully capitalise on her wayward serving, instead getting in her own way with four double-faults to no aces.
It meant the Tunisian threatened to run away with the match when she secured another break in the first game of the second set, but Tomljanovic fought back in what developed into a back-and-forth struggle, with six breaks of serve split evenly through the first nine games.
Although that theme initially continued in the tie-break, with the first four points all going against the serve, Jabeur finally found some big serves when it mattered most to finish the job.
A semi-final against either Coco Gauff or Caroline Garcia now lies before Jabeur, who had not previously gone beyond the third round in New York.
Data Slam: Jabeur powers through
Jabeur lacked accuracy with her serve – landing 40 per cent of her first serves across the match – but was dominant when she was able to keep it fair, converting nine of her 11 accurate first serves in the opener to illustrate the significant power gap between the two women.
Jabeur – 4/2
Tomljanovic – 1/9
Jabeur – 29/30
Tomljanovic – 12/24
BREAK POINTS WON
Jabeur – 5/6
Tomljanovic – 4/6