Mattek-Sands and Mirza have played on and off together since 2006, highlighted by two titles - most recently at Brussels last month. Twice quarterfinalists at majors, including at Wimbledon in 2008, the American-Indian duo were 64 62 winners over Alla Kudryavtseva and Sloane Stephens on Tuesday.
The highest seeded team in action so far, No.4 seeds Maria Kirilenko and Nadia Petrova, have been one of the most prolific duos on the WTA this year, with a title at Miami and runner-up showings at Roland Garros and 's-Hertogenbosch among the accomplishments that have helped them to third place in the race to qualify for one of the four spots available for the season-ending TEB BNP Paribas WTA Championships - Istanbul 2012.
Kirilenko and Petrova were rewarded for those efforts on Tuesday by being named as one of Russia's doubles duos for this summer's Olympics, which will be played at the All-England Club. And on the same day, they bested Timea Babos and Alberta Brianti, 63 60, to reach the second round here.
Four other Olympic teams also won their openers - Kazaks Yaroslava Shvedova and Galina Voskoboeva, Romanians Irina-Camelia Begu and Monica Niculescu, Poles Klaudia Jans-Ignacik and Alicja Rosolska and Italians Flavia Pennetta and Francesca Schiavone.
Playing their fourth event, seventh-seeded Shvedova and Voskoboeva had their most one-sided victory yet with a 61 60 rout of Simona Halep and Aleksandra Wozniak. Fifteenth-seeded Begu and Niculescu scored a 63 62 triumph over British crowd favorites Elena Baltacha and Anne Keothavong. Jans-Ignacik and Rosolska broke a five-match losing streak with a 46 76(6) 64 win over 12th-seeded Anabel Medina Garrigues and Arantxa Parra Santonja, the only seeds to lose so far. Pennetta and Schiavone beat Anastasia Pavlyuchenkova and Lucie Safarova, 62 57 64.