Field hockey teams battle in 2012 Olympic preliminary rounds

May 2, 2012: China, red outfits, play Argentina in a women's preliminary round field hockey match at the Riverbank field hockey arena in the Olympic Park in London. (AP2012)

May 2, 2012: China, red outfits, play Argentina in a women's preliminary round field hockey match at the Riverbank field hockey arena in the Olympic Park in London.

May 2, 2012: Australia's Jason Wilson hits a shot surrounded by India players during the men's preliminary round field hockey match between India and Australia at the Riverbank field hockey arena in the Olympic Park in London.

May 2, 2012: Argentina's Silvina D'Elia, right, hits a shot during the women's preliminary round field hockey match between Argentina and China at the Riverbank field hockey arena in the Olympic Park in London.

May 2, 2012: Argentina's captain Carla Rebecchi hits a penalty shot during the women's preliminary round field hockey match between Argentina and China at the Riverbank field hockey arena in the Olympic Park in London.

May 2, 2012: Argentina's captain Carla Rebecchi, left, hits a penalty shot during the women's preliminary round field hockey match between Argentina and China at the Riverbank field hockey arena in the Olympic Park in London.

May 2, 2012: Argentina's Rocio Sanchez Moccia, center, goes down as she competes with China's Ma Wei, right, during the women's preliminary round field hockey match between Argentina and China at the Riverbank field hockey arena in the Olympic Park in London.

May 2, 2012: Argentina's Daniela Sruoga, center top, celebrates with her teammates after scoring during the women's preliminary round field hockey match between Argentina and China at the Riverbank field hockey arena in the Olympic Park in London. (AP2012)