Hours after losing to Serena Williams in the singles final Saturday, Zvonareva and fellow Russian Elena Vesnina were beaten by American Vania King and Kazakhstan's Yaroslava Shvedova 7-6 (8-6), 6-2.
Zvonareva, who lost her serve once in each, was in tears before the second set began and again after the match. King and Shvedova saved a set point in the tiebreaker and then pulled away.
King and Shvedova are the fifth unseeded team to win the title since seedings began in 1927. Shvedova is the first player from Kazakhstan to win a Wimbledon championship.
The women's doubles final was the tournament's first with two unseeded teams since 1975.
ANOTHER SURPRISE: The unseeded pair of Jurgen Melzer, of Austria, and Philipp Petzschner, of Germany, won the Wimbledon men's doubles title for their first Grand Slam championship.
They beat 16th-seeded Robert Lindstedt , of Sweden, and Romania's Horia Tecau 6-1, 7-5, 7-5.
This is the first season Melzer and Petzschner have teamed up in doubles. They are the first unseeded team to win the title since qualifiers Stephen Huss and Wesley Moodie did it in 2005.
The second set went with serve until 6-5, when Tecau was broken at love. Melzer and Petzschner did it again in the third set to finish the match.