Keys received a last-minute wildcard into the tournament and has made the most of her opportunity. After seeing off Camila Giorgi in the first round, Keys was even more clinical against Doi, reeling off the final 10 games of the match to triumph, 6-2, 6-0.
This was the American's 45th victory of a highly impressive campaign that has seen her reach the second week of all four majors and break into the Top 10. The next milestone could be looming: a place at the BNP Paribas WTA Finals Singapore presented by SC Global.
Also looking to secure a spot in Singapore are Garbiñe Muguruza and Dominika Cibulkova, who were equally impressive in Thursday's final two matches. Muguruza needed barely an hour to overpower Monica Niculescu, 6-1, 6-1, while Cibulkova swept aside Annika Beck, 6-1, 6-3.
"It was a fun match - it was actually tough, but fun - because it's a different sort of opponent and I had to be really concentrated and calm, which I did," Muguruza said. "I'm really happy with today - she's such a different player, she can make you feel very uncomfortable so I just went for my shots.
"I knew how she was going to play against me, so I was just playing my game and I think it worked very well."
Having trailed 4-1 in the opening set, a run of four straight games helped Pavlyuchenkova turned the match around and book a quarterfinal showdown with Cibulkova.
? WTA Linz (@WTALinz) October 13, 2016