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Jessica Steffens of the United States shoots and scores a goal as Wang Yi of China attempts to defend during their women's water polo preliminary round match at the 2012 Summer Olympics, Friday, Aug. 3, 2012, in London.
LONDON—Maggie Steffens scored three goals and the U.S. women's water polo beat China 7-6 in their final preliminary-stage game to remain undefeated at the London Olympics.

The U.S. finished the preliminary round even with Spain at the top Group A with five points. But Spain earned the top spot because of the tiebreaker, making the Americans the group's second-seeded team for the knockout stage.

The U.S. will play 2012 European champion Italy in Sunday's quarterfinals.

China finished the group stage winless and will play Group B winner Australia in the quarterfinals.