Simona Halep recovered from a slow start to beat Lesia Tsurenko in straight sets on Friday and advance to the semi-finals of the Cincinnati Masters.
Halep gave up breaks in each of her first two service games to find herself 1-4 down against Tsurenko at the WTA Premier 5 event in Ohio.
The world number one saved four break points in the sixth game to finally hold.
And the determination of the Romanian turned the match on its head, Halep reeling off the next 10 games to take complete control of the contest.
Tsurenko did manage to break in the sixth game of the second set to avoid suffering a bagel, but it was no more than a token gesture from the beleaguered Ukrainian.
Halep had already beaten Ashleigh Barty earlier in the day to complete a third-round match that had been delayed due to rain.
And the Wimbledon champion was satisfied with her efforts in managing the additional workload.
"I think I changed the game, I lost the first games without really thinking," she said in an on-court interview.
"To play two matches in the same day and to win both of them, I'm really happy.
"For everybody it was the same, it was a tough day, but I'll not complain."
A beaten finalist in Cincinnati in 2015 and 2017, Halep will take on 13th seed Madison Keys or Aryna Sabalenka in the last four.
|New Durham captain Bancroft will learn from ball-tampering scandal, says club´s CEO|
|Foden: I´m learning from Silva and Kompany|
|Ferguson and Gutherson shine in Eels triumph, Tigers win again too|
|Davies wants Bale back at Tottenham|
|Sterling has been the best in the Premier League, says Maguire|
|Hend reigns following dramatic finish at Maybank Championship|
|The NBA should fine the Heat! - Brooks says Wade is too good to retire|
|Durant: Nothing odd about Warriors´ 35-point loss|
|Reds ease past Brumbies|
|Kvitova, Wozniacki advance as Osaka bows out|
|Andreescu overcomes Kerber again to extend winning run|
|MLS Review: Zimmerman stunner sends Los Angeles top|
|Walker scores 36 points as Hornets shock Celtics in Charlotte|
|Kingsbury says ´everything´s on the table´ with number one pick|
|Zverev stunned by Ferrer as Cilic, Wawrinka lose|
|Half of Europe wanted him – Casemiro praises Madrid´s Militao capture|
|Irving joins Celtics greats in record book, then questions team´s strategy|
|Tite to consider Vinicius for Copa America|
|Casey clings onto lead ahead of Johnson|
|Sancho hails Sterling´s mentoring influence with England|
|Kean out to break records after netting maiden Italy goal|
|Grealish´s England chances would be helped by Premier League football – Southgate|
|Federer survives Albot test|
|Luis Enrique defends Morata after Norway misses|
|Glasgow and Munster march on in Conference A|
|Martinez salutes ´extraordinary´ Hazard ahead of 100th Belgium cap|
|Ramos: Luis Enrique has a wonderful philosophy|
|Schlupp puzzled by CAF mix-up|
|There is still nothing – Hazard dismisses reports of Real Madrid agreement|
|Lyon back to winning ways as Perpignan claim first home victory|
|McCarthy happy to take 1-0 win against Gibraltar|
|Hudson-Odoi and Sancho bringing ´raw mentality´ to England|
|Tite refusing to panic after woeful Panama draw|
|Italy 2 Finland 0: Young stars Kean and Barella inspire victory|
|Top seed Osaka dumped out of Miami Open by Hsieh|
|Spain 2 Norway 1: Ramos penalty gets La Roja up and running|
|Wasps keen on Edwards reunion|
|Liverpool title win would make me the happiest man in the world - Gerrard|
|Saracens cut Exeter´s lead with Harlequins victory|
|Injured Serena Williams withdraws from Miami Open|
|Yaha scores four as Catalans complete comeback to sink Leeds|
|Sagan´s Milan-San Remo dream continues to elude him|
|Patriots owner Robert Kraft ´truly sorry´ over scandal|
|Brazil 1 Panama 1: Paqueta´s first goal cannot prevent embarrassing draw|
|Gibraltar 0 Republic of Ireland 1: McCarthy starts second spell with underwhelming win|
|Warriors star Stephen Curry rested for Mavericks game|
|Harbhajan puts Kohli´s RCB in a spin in IPL opener|
|Axing Sunwolves will damage Asian rugby, claims CEO|
|Chiefs tame Bulls to claim first win of Super Rugby season|
|Low: Sane, Gnabry fit to face Netherlands|
|Northampton expect Hartley return this season|
|Alaphilippe claims first monument with Milan-San Remo win|
|It was only a friendly – Martino tempers expectations after winning start with Mexico|
|Bale ´raring to go´ for Wales|
|Fury-Wilder rematch not until 2020|
|Van Dijk preparing for ´special game´ against Germany|
|Burundi reach first AFCON at expense of Aubameyang´s Gabon|
|Netherlands can´t underestimate Germany, warns Koeman|
|Zion Williamson will not dunk on me, says UCF´s Tacko Fall|
|Anscombe wants Cardiff stay, says Blues coach|
|Thigh problem leaves Coman in doubt|
|Injured Ramsey withdraws from Wales squad|
|Walton wants Lakers to battle on after missing playoffs|
|Folau equals record as Waratahs end Crusaders streak|
|Mourinho targets June return to club management|
|Richarlison pays tribute to ´essential´ Silva|
|Zion out to avoid ´what ifs´ in March Madness|
|Crusaders & Waratahs honour Christchurch attack victims before Super Rugby clash|
|Wilshere targets West Ham return before end of the season|
|Roosters return to form to get off the mark|