The past few months have already brought Cibulkova significant moments on and off the court, and her 7-5, 6-0 victory over Doi confirmed that on Monday morning she will return to the Top 10 for the first time in over 18 months.
Cibulkova first broke into the Top 10 shortly after her run to the Australian Open final in 2014, staying there until Achilles surgery laid her low at the start of the following year. This star quality has been evident for much of 2016, a WTA-leading 37 wins, two titles and a Wimbledon quarterfinal appearance prompting a charge up the rankings.
Against Doi, it took a while for her class to shine through. But when the Slovak eventually acclimatized to her opponent's frantic pace - and the sweltering conditions - she did so emphatically: a run of 11 straight games setting up a semifinal meeting with No.3 seed Johanna Konta.
"Today was really, really tough. She was playing fast from the first ball, but once I found out what I needed to do to win I was doing the right thing all the way through the match," Cibulkova, who lifted the Stanford title three years ago, said. "I know the court, I know the balls, I know what I have to do to go all the way here."
Like Cibulkova, Konta was forced to ride out some rocky moments against Zheng Saisai, recovering from a break down in the final set to win, 6-2, 4-6, 6-3.
"I think the level of tennis really took its toll on me - she made it incredibly tough to play the way I wanted to play - so I was very glad I was able to string some points together in the third set," Konta said.