Date-Krumm fought off two match points in an almost three-hour first round defeat of Garbiñe Muguruza on Tuesday, and while her second round encounter against Tadeja Majeric wasn't as dramatic, it was not routine.
The Japanese 43-year-old overcame a 5-3 first set deficit in her 76(4) 63 triumph, setting up a clash in Friday's quarterfinals with fourth-seeded Ekaterina Makarova and making her the oldest quarterfinalist in the draw by 15 years.
Date-Krumm will be contesting her eighth WTA quarterfinal since returning to WTA action in 2008 after a 12-year absence. She is 3-4 in those matches, with her having won the first of those at Seoul in 2009 en route to becoming the second-oldest player in the Open Era to capture a WTA title. Interestingly enough, this will be the sixth of those eight WTA quarterfinals to have occurred in Asia.
Also escaping an early hole was Makarova's usual doubles partner, No.5 seed Elena Vesnina. Down 3-1 to Nicha Lertpitaksincha, the Russian reeled off five straight games en route to a 63 63 victory. Next up for her is Julia Goerges, whom she is 3-0 against.
"We played a few times before, but it's been a few years, so this is a different story, a different tournament," Vesnina said. "It's going to be a very difficult match for both of us. I'm really looking forward to it."
And not to be outdone, eighth-seeded Chinese Peng Shuai made comebacks in both sets versus Alexandra Dulgheru. She was down 3-1 in the first set and 4-1 in the second but emerged with a 63 64 win. Her rollercoaster season has now consisted of a runner-up showing at Shenzhen, first round losses at Hobart and the Australian Open and at least a quarterfinal outing here.
Securing semifinal spots in doubles were No.2 seeds Andrea Hlavackova and Anabel Medina Garrigues, No.3 seeds Alla Kudryavtseva and Anastasia Rodionova and wildcards Noppawan Lertcheewakarn and Vera Zvonareva.