Former world number one Venus Williams came back to beat fourth seed Patty Schnyder in the second round of the Bausch & Lomb Championships in Florida.
Williams maintained her perfect record against Schnyder
Williams, playing just her third tournament of the year after struggling with a wrist injury, won 3-6 6-3 6-4.
The 26-year-old was a break down in the final set before fighting back to take her record against Schnyder to 9-0.
The unseeded Williams, currently ranked world number 32, will now play fellow American Meilen Tu in the third round.
Second seed Jelena Jankovic thrashed Czech qualifier Iveta Benesova 6-1 6-2 in her opening match.
The 22-year-old Serbian moves into the last 16 and a match against Alona Bondarenko of Ukraine.
It was one of those days where I felt I was just a
little bit off
Croatia's Karolina Sprem had a fine 6-3 6-3 win over seventh seed Li Na of China, while eighth seed Tatiana Golovin beat Catalina Castano 6-0 6-3.
Other seeds who made it through to the next round included Tatiana Golovin, Samantha Stosur, Sybille Bammer and Alona Bondarenko.
Williams admitted that her previous good record against Swiss player Schnyder had helped her.
"Going to a match for her against an opponent
you've never won against, I think that's tough," she said.
"That probably played a role. She was probably
nervous, too. She was hitting some double faults at times
when there was no need to.
"It was one of those days where I felt I was just a
little bit off, and against a player like Patty, you need
that extra bit.
"I felt I was sometimes hitting in the open court too much and that some of the
balls were floaters. That's why I went more to a serve and
volley attack in the third set."