The sixth-seeded Mattek defeated fifth-seeded Aleksandra Wozniak
7-6 (4), 6-3 of Canada in one semifinal, while top-seeded Petrova
defeated first-time tour semifinalist Angela Haynes of the United
States 6-1, 6-3.
Petrova, who hasn't dropped a set this week, will meet Mattek
for the first time.
Petrova, ranked among the top 10 for most of the last four
years, will be playing in her fourth final this year, hoping to add
to the Cincinnati title she won in August.
Mattek was ranked 153rd in April before turning around her
career with a hot streak in May and July. She qualified for the
French Open and reached the second round, made the grass semifinals
at Birmingham, the fourth round of Wimbledon, and the semifinals at
Los Angeles, after which she made her top-50 debut.
A back injury hampered her in late summer, and this week was her
first tournament since the U.S. Open.