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Argentina's team rowers celebrate their gold medals during the medal ceremony for the rowing men's quadruple sculls final at the Pan American Games in Ciudad Guzman, Mexico, Tuesday Oct. 18, 2011. Eduardo Verdugo, Associated Press
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Daniela Larreal, from Venezuela, competes in the cycling women's speed 200m flying start qualifying event at the Pan American Games in Guadalajara, Mexico, Tuesday, Oct. 18, 2011. Daniela Larreal set a new Pan American record. Daniel Ochoa De Olza, Associated Press
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Margot Shumway of the United States celebrates as she poses for pictures during the medal ceremony for the rowing women's single sculls final at the Pan American Games in Ciudad Guzman, Mexico, Tuesday Oct. 18, 2011. Eduardo Verdugo, Associated Press
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Chile's Kristel Kobrich competes in a preliminary heat of the women's 800m freestyle at the Pan American Games in Guadalajara, Mexico, Tuesday Oct. 18, 2011. Julie Jacobson, Associated Press
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Mexico's Analicia Ramirez, left, and Lila Perez celebrate their gold medals for the rowing women's lightweight double sculls final at the Pan American Games in Ciudad Guzman, Mexico, Tuesday Oct. 18, 2011. Eduardo Verdugo, Associated Press
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Sean Mahoney, of the United States, propels himself through the water during a preliminary heat of the men's 200m breaststroke at the Pan American Games in Guadalajara, Mexico, Tuesday, Oct. 18, 2011. Julie Jacobson, Associated Press
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Maria Luisa Calle of Colombia leads team members Serika Mitchell Guluma and Lorena Maria Vargas in the cycling women's team pursuit qualifying event at the Pan American Games in Guadalajara, Mexico, Tuesday Oct. 18, 2011. Jorge Saenz, Associated Press
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Mexico's Analicia Ramirez, left, and Lila Perez celebrate their gold medals for the rowing women's lightweight double sculls final at the Pan American Games in Ciudad Guzman, Mexico, Tuesday Oct. 18, 2011. Eduardo Verdugo, Associated Press
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Sumaia Ribeiro from Brazil competes in the cycling women's speed 200m flying start qualifying event at Pan American Games in Guadalajara, Mexico, Tuesday Oct. 18, 2011. Jorge Saenz, Associated Press
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Silver medal winner Argentina's Maria Best celebrates as she poses for pictures during the medal ceremony for the rowing women's single sculls final at the Pan American Games in Ciudad Guzman, Mexico, Tuesday Oct. 18, 2011. Eduardo Verdugo, Associated Press
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Brazil's Sarah Correa strokes her way through a preliminary heat of the women's 800m freestyle at the Pan American Games in Guadalajara, Mexico, Tuesday, Oct. 18, 2011. Julie Jacobson, Associated Press
By Associated Press

GUADALAJARA, Mexico — The United States and Mexico won a pair of gold medals in rowing events Tuesday at the Pan American Games.

American Margo Shumway won the first gold of the day in the women's single sculls. She trailed late in the race but surged ahead at the finish. The American duo of Michael Gennaro and Robert Otto won the men's coxless pairs ahead of the Brazlian team.

The Mexican duo of Analicia Ramirez and Lila Perez Rul won the women's double sculls before Alan Armenta and Gerardo Sanchez won the men's event.

The United States leads the medal count with 18 golds.

Argentina also won a gold in rowing, finishing first in the men's quadruple sculls. Cuba was second and Mexico finished third.

Later Tuesday, Brazilian swimmer Thiago Pereira will be going for a fourth gold medal in the pool.

At the games four years ago in Rio de Janeiro, the Brazilian won six gold medals to break Mark Spitz's record for most golds in one Pan Am Games.

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