MIAMI, FL, USA - Two seeded teams remained as of the semifinals but only one was able to make it through to the final, as the doubles competition heated up at the $4.5-million Sony Ericsson Open on Friday.

Check out the Miami doubles draw right here!

The first semifinal held true to form, with No.3 seeds Nadia Petrova and Samantha Stosur beating Chan Yung-Jan and Zheng Jie, 61 75. After cruising through a 22-minute first set, Petrova and Stosur found themselves down 5-2 in the second set; but it was short-lived danger, as they won 20 of the next 24 points to roll to a straight set victory over the Taiwanese-Chinese duo.

The second semifinal, played at night, saw the unseeded combo of Gisela Dulko and Flavia Pennetta upset No.4 seeds Lisa Raymond and Rennae Stubbs, 64 64. Dulko and Pennetta won the first set on the strength of one break of Stubbs' serve; everyone was broken in the second set except for Pennetta, but that 2-1 ratio led to another set - and the match - for the duo.

See how the Miami finalists are doing in the doubles rankings!

Of the two finalist teams, Petrova and Stosur have far more Sony Ericsson WTA Tour doubles titles between them - 40, the Russian with 18 and the Australian with 22. But they haven't won a title together whereas Dulko and Pennetta have won three together, at Bogotá in 2006 and at Hobart and Bastad in 2009. Together, Dulko and Pennetta own 15 titles - the Argentine nine, the Italian six.