Since turning professional nearly a decade ago, Doi has registered a handful of wins over players inside the Top 50, although none so lofty as World No.21 Peng. Such is the strength in depth of women's tennis these days, the difference between the elite and those looking in from the outside has never been smaller, something Doi illustrated in her two hours on court with Peng.
In a see-saw encounter, it was Doi that kept her composure at the business end of the contest, breaking three times in the final set to run out a 6-3, 2-6, 6-2. winner.
"She's a very strong player," Doi said after the match. "She's No.1 seed, so it was always going to be difficult for me, but I just tried to go out and enjoy the match and luckily I played well."
In the bottom half of the draw, Vera Zvonareva's comeback continued to gather momentum as she knocked out No.8 seed Zhang Shuai, 7-6(6), 6-3. Zvonareva, who won the tournament in both 2009 and 2010, is still getting back in the swing of things after a long spell out with a shoulder injury, and was glad to come through a close encounter.
"I felt pretty good. It was a very tough match and we had a very close first set," Zvonareva said. "She's a very good player and has had some great results over the past three years while I was away. It was a great opportunity for me to test myself and I'm very pleased with how I played and that I fought very hard."