The No.6-seeded Pavlyuchenkova beat the No.7-seeded Cornet in an hour and 13 minutes, 62 62.
"I knew there was no choice today but to play really aggressive, consistent tennis," Pavlyuchenkova said. "At the start of the second set she started playing better - she was more relaxed, which is normal. I knew it would get tougher like that and that I had to increase my level, so I focused hard and played more aggressive from there. I'm happy it worked out. I'm very pleased with my performance."
"I didn't play so well today, and Anastasia played well," Cornet said. "She was way more aggressive than me - I was only running, and I couldn't really put myself into the match at any time. Maybe at the beginning of the second set, but it wasn't enough. I'm disappointed the way I finished the tournament.
"I'm sad the tournament is over. I would have loved to be in the semifinals. But she deserves it."
Pavlyuchenkova, a former World No.13, is now 4-0 lifetime against Cornet, a former World No.11.
"I don't really know why I have a good record against her," Pavlyuchenkova said. "Maybe every time we play it's an important match, so I always play like it's the last match - like today, I knew I had to raise my level because it was a really important match, and I'm happy it worked out for me again."
The Russian clinched second place in Group Serdika with the victory, meaning she will move through to the semifinals. First place in the group went to Simona Halep, who went 3-0 in the round robin stage.
"That was my goal coming here, to get out of the group," Pavlyuchenkova said. "When I lost my first match I wasn't sure if my goal was still possible, but now it has happened, so I'm really happy.
"I'm just going to enjoy the semifinals and try my best to go through to the finals."
Though the head-to-head swings heavily in Pavlyuchenkova's favor, Pavlyuchenkova and Cornet couldn't be closer on the rankings - Pavlyuchenkova is No.26, Cornet No.27. They are also separated by just 100 points on their ranking points total - the Russian has 1890 points, the Frenchwoman 1790.