However, the Slovak failed to convert, twice making return of serve errors. After Dementieva held to 5-3, it was her turn to take the momentum. She broke to pull to 5-4, the beneficiary of two Hantuchova double faults, and then broke again to go up 6-5. She held to take the first set and broke Hantuchova in her first three service games in the second.

It had to be a particularly painful loss for Hanchucova, who has won only four of 15 matches against Dementieva and has lost nine of their last 10 meetings.

The early promise that Hantuchova displayed in her career has rarely materialized at Grand Slams. At age 19, she reached the quarters of three straight Grand Slams, at the 2002 Wimbledon and the US Open, and the 2003 Australian Open. She's advanced past the round-of-16 only once since, a semifinal appearance at the 2008 Australian Open.

Dementieva started out 2010 on fire, winning two of her first three tournaments. However, a calf injury in the spring forced her to retire at the French Open and pull out of Wimbledon.

She dropped out of the top 10 in August for the first time in three years, but looks to be playing herself back into form, which should make for an entertaining quarterfinal against Stosur.

Talking about next opponent of last 16 round, Dementieva said: "I think it's gonna be different match. We haven't played for a long time, and Samantha (Stosur) really improves her game a lot. She's playing very well this season, you know, finalist in the French Open."

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