The Americans earned a berth in the semifinals against Beijing bronze medallists Xue Chen and Zhang Xi. The Chinese team has beaten the two-time defending Olympic champions the last three times they've met, including the final of the Moscow Grand Slam last month.
"We're a different team since then," Walsh Jennings said after beating Marta Menegatti and Greta Cicolari 21-13, 21-13. "We're going to come out and give it all we can, because we have to."
The Chinese team, which lost its first match in London, the Chinese team beat Austrian sisters Stefanie and Doris Schwaiger 21-18, 21-11. Although they have nine losses and five wins against the Americans, they have not lost to Walsh Jennings and May-Treanor in a year, including a 21-14, 21-14 victory in Moscow this June.
"Losing is one thing," Walsh Jennings said. "But losing in a way that you can't walk away with your heads held high is another. Misty and I have really come together. We've looked at ourselves individually and as a team."
In the other quarterfinals, the No. 2 U.S. women's team of Jennifer Kessy and April Ross were scheduled to meet the Czech Republic and top-seeded Larissa and Juliana of Brazil were to play Germany.