Top seed Karolina Pliskova was rescued by the rain at the Zhengzhou Open as Polona Hercog's fightback was brought to a halt.
Pliskova started brightly to take the first set 6-3 but the world number two was serving to stay in the second at 5-2 down when the weather intervened, as it had several times during the day.
The duo will resume on Thursday at the WTA Premier event to settle who will make it through to the last eight.
Sofia Kenin awaits the winner after the sixth seed defeated Alize Cornet 6-4 6-2.
Petra Martic, seeded seventh, also progressed but had to battle back from a set down to overcome Fiona Ferro 3-6 6-1 6-2.
There was one seed who suffered a loss, though, with Caroline Garcia beaten 7-5 6-2 at the hands of Kristina Mladenovic.
.@KikiMladenovic advances to the @zhengzhouopen quarterfinals!
— WTA (@WTA) September 11, 2019
Defeats No.8 seed Caroline Garcia 7-5, 6-2. pic.twitter.com/2j0UMCxtNM
Top Headlines
Featured Matches
Football
Arsenal
English Premier League
2-0
Brighton and Hove Albion
Aston Villa
English Premier League
2-0
Chelsea
Fulham
English Premier League
0-1
Newcastle United
Leeds United
English Premier League
2-0
West Bromwich Albion
Leicester City
English Premier League
2-1
Tottenham Hotspur
Manchester City
English Premier League
2-0
Everton
Liverpool
English Premier League
1-0
Crystal Palace
Cricket
Sussex
Sri Lanka
Teams will be announced at the toss
Multan Sul..
Quetta Gla..
Teams will be announced at the toss
Islamabad..
Karachi Ki..
Teams will be announced at the toss
Peshawar Z..
Lahore Qal..
Teams will be announced at the toss
Islamabad..
Quetta Gla..
Teams will be announced at the toss
Lahore Qal..
Islamabad..
Teams will be announced at the toss
Mumbai Ind..
Delhi Capi..
Teams will be announced at the toss