The WTA Western and Southern Open was halted because of rain, but Simona Halep and Garbine Muguruza managed to progress to the quarter-finals earlier in the day.
Wet conditions in Cincinnati forced the cancellation of play approaching midnight after second seed Halep and Muguruza already booked their spots in the last eight.
Halep was a winner in straight sets against Anastasija Sevastova, while fourth seed Muguruza fended off four match points in her victory over Madison Keys.
Former world number one Caroline Wozniacki also won through but defending champion Karolina Pliskova was halted by rain at the Premier tournament.
Pliskova was leading Camila Giorgi 3-0 in the first set when play was stopped, while Sloane Stephens, Ekaterina Makarova, Elina Svitolina and Julia Goerges were unable to take to the court.
HALEP MARCHES ON
The Romanian star is a woman on a mission after easing past Sevastova 6-4 6-3.
A runner-up in 2015 and semi-finalist last year, Halep advanced to the Cincinnati quarter-finals for a fifth successive year.
Halep was down 4-2 in the opening set but she rallied to win the next four games and never looked back.
"The match felt quite tough; it was not easy at all," Halep said. "I can say that I'm not playing my best tennis in this moment, but winning, even if I play less good, I think it's a big plus for me. It gives me a little bit more power, inside, that I can handle it."
Johanna Konta awaits in the quarters following her 6-3 6-4 win over Dominika Cibulkova.
MUGURUZA SURVIVES KEYS TEST
The Wimbledon champion was forced to dig deep, very deep against sixth seed Keys.
Following a lengthy rain delay in the final set, Muguruza trailed 4-2 and faced elimination at 6-5 and 40-15 before prevailing 6-4 3-6 7-6 (7-3).
Next up is eighth seed Svetlana Kuznetsova, who defeated Carla Suarez Navarro 6-4 6-2.
WOZNIACKI ENDS BARTY RUN
Ashleigh Barty took down Venus Williams but the Australian was stopped in her tracks by Wozniacki.
Wozniacki claimed a 6-4 6-2 victory as she progressed to the last eight of the tournament for the fourth time in her career but first since 2014.
The two-time US Open finalist will face either Pliskova or Giorgi on Friday.
|Chase hit with two-year ban for cocaine use|
|Jones returns to lead much-changed Wales against All Blacks|
|Chelsea´s best chance of success is Champions League, claims Lampard|
|F1 Raceweek: Hamilton not relishing imminent Halo, Vettel wants Baku awards|
|Cummins savours taking ´dream´ Root wicket|
|Jones makes nine England changes as Simmonds starts at number eight|
|Robben: It could be over for me after this season|
|Newcastle Jets 4 Melbourne Victory 1: Nabbout at the double|
|Chawrasia leads from Fitzpatrick in Hong Kong|
|Vince revels in silencing the doubters|
|Happy Sanchez could win the Premier League for Arsenal, Lauren claims|
|Davis leads Australian Open as Spieth struggles in the wind|
|Halep tips Dimitrov for grand slam glory|
|The Ashes round-up: England falter after Vince and Stoneman half-centuries|
|Angered Neymar storms away from Real Madrid questions|
|Bayern played their worst ´for a long time´ - Boateng|
|Australia fight back on tight first day in Brisbane|
|Neymar form no surprise for Alves|
|Fiji ready for another mission impossible - Naiqama|
|Vince helps England continue fine start|
|Thunder roll as Westbrook goes off against Warriors, Cavs win|
|Kiwis would consider Bennett as coach|
|Meninga unhappy with Aussie preparations ahead of World Cup semi|
|Federer congratulates Basel after Man Utd scalp|
|Heat snap Celtics´ 16-game winning streak|
|Spurs star Leonard has unique issue, Popovich says|
|England steady after early Cook loss in Brisbane|
|Gremio 1 Lanus 0: Cicero gives Brazilians advantage in Libertadores final|
|Hazard: I admire Madrid, but I´m happy at Chelsea|
|Neuer or De Gea? Digne says Ter Stegen is world´s best keeper|
|Allegri satisfied with draw against ´extraordinary´ Barcelona|
|Nainggolan reaffirms Roma commitment after Simeone praise|
|Chiefs sign veteran CB Revis|
|England choose to bat as Warner, Marsh cleared to play for Australia|
|Beathard, not Garoppolo, named 49ers starter v Seahawks|
|Simeone hails Griezmann´s ´extraordinary´ volley|
|Emery hails Neymar after stunning Celtic win|
|Freeney joins Lions day after being cut by Seahawks|
|Championship Review: Wolves thrash 10-man Leeds, Middlesbrough cruise|
|Goncharenko delighted for clean sheet star Akinfeev|
|I hope Barcelona rest Messi – Jesus|
|Broncos name Lynch starting QB for Raiders game|
|Thiago suffered a serious injury, says Heynckes|
|Valverde explains decision to bench Messi|
|Coleman the latest to join Rebels revolution|
|LeBron: Defensive consistency key to Cavs winning streak|
|Bills revert to Tyrod Taylor as starting QB after Nathan Peterman disaster|
|Absent Stokes wishes England well|
|Iniesta hails ´splendid´ Ter Stegen as Barcelona seal last-16 spot|
|Griezmann shrugs off goalless streak after wonderstrike keeps Atletico´s hopes alive|
|We should have been 5-0 up – Mourinho unimpressed with wasteful United|
|Toure reveals Guardiola anger with City´s Feyenoord display|
|Warriors star Durant says he will play against Thunder|
|Paris Saint-Germain set Champions League scoring record in Celtic rout|
|Sporting CP 3 Olympiacos 1: Dost on target as hosts stay in contention|
|Bielsa suspended by struggling Lille|
|Anderlecht 1 Bayern Munich 2: Lewandowski and Tolisso give visitors win|
|Atletico Madrid 2 Roma 0: Griezmann returns to form with wondergoal|
|Basel 1 Manchester United 0: Late Lang goal leaves Mourinho´s men with work to do|
|Paris Saint-Germain 7 Celtic 1: Cavani and Neymar score braces in sparkling win|
|Juventus 0 Barcelona 0: Messi benched but Valverde´s men in last 16|
|Bennett backs New Zealand to recover from World Cup exit|
|No Samoa donation from England squad - Borthwick|
|Conte pleased to take pressure off Atletico clash|
|Success in Europe will help Milan´s league form, Montella claims|
|Bauza sacked by Saudi Arabia|
|Browns´ Josh Gordon returns to practice|
|Azarenka confirms place at ASB Classic|
|Willian: For me, it was a penalty|
|Akinfeev keeps first Champions League clean sheet since November 2006|