The eighth-seeded Errani won her first career WTA Tour event at Palermo at the beginning of this month. She has won 10 matches in a row.
"I haven't changed anything this year," Errani said. "I just try to practice hard every day, and the results are starting to come. At the beginning of the year I was just hoping to make it to the Olympic team and I did make it, which I'm really excited about."
The player who was serving lost the game half of the time during the match, with Errani converting 6-of-10 break-point chances, and the fourth-seeded Medina Garrigues claiming 3-of-9.
"I think we were both tired, but we both tried hard and it was a nice match," Errani said. "We know each other very well. We practice together in Valencia, and I've played her a few times before. I think she maybe struggled a bit with the long points and made some errors, which helped me today."
"The hardcourts here are a little bit slower, which probably helped me against aggressive players like Kirilenko and Wozniacki," Errani said. "It was probably better for me to play against them than against Anabel today, because it made it more difficult for them to close the points out."
Medina Garrigues dropped to 8-5 in finals.