Canada's Krystina Alogbo (R) and Alison Gregorka of the U.S. fight for the ball during their women's waterpolo gold medal match at the World Championships in Rome July 31, 2009. REUTERS/Tony Gentile (ITALY SPORT WATER POLO)

Canada's Krystina Alogbo (L) and Alison Gregorka of the U.S. fight for the ball during their women's waterpolo gold medal match at the World Championships in Rome July 31, 2009. REUTERS/Tony Gentile (ITALY SPORT WATER POLO)

Canada's Krystina Alogbo (C) and Alison Gregorka of the U.S. fight for the ball during their women's waterpolo gold medal match at the World Championships in Rome July 31, 2009. REUTERS/Laszlo Balogh (ITALY SPORT WATER POLO)

Alison Gregorka (L) and Jessica Steffens of the U.S. celebrate at the end of their semi-final water polo match against Greece at the World Championships in Rome July 29, 2009. REUTERS/Stefano Rellandini (ITALY SPORT WATER POLO)

Georgia Lara (L) of Greece fights for the ball with Alison Gregorka of U.S during their semi-final match at the World Championships in Rome July 29, 2009. REUTERS/Stefano Rellandini (ITALY SPORT WATER POLO)

Alison Gregorka of the U.S. (top) fights for the ball with Maica Garcia of Spain during their quarterfinal match at the World Championships in Rome July 27, 2009. REUTERS/Max Rossi (ITALY SPORT WATER POLO)

Alison Gregorka of the U.S. (R) fights for the ball with Maica Garcia of Spain during their quarterfinal match at the World Championships in Rome July 27, 2009. REUTERS/Max Rossi (ITALY SPORT WATER POLO)

He Jin (R) of China fights for the ball with Alison Gregorka of the U.S. during their water polo match at the World Championships in Rome July 25, 2009. REUTERS/Laszlo Balogh (ITALY SPORT WATER POLO)

(L-R) Elsie Windes, Heather Petri, Jessica Steffens and Alison Gregorka of the U.S. celebrate after winning their women's semi-final water polo match against Australia at the Beijing 2008 Olympic Games August 19, 2008. REUTERS/Laszlo Balogh (CHINA)

Alison Gregorka of the U.S. (L) and teammate Heather Petri celebrate after winning their women's semi-final water polo match against Australia at the Beijing 2008 Olympic Games August 19, 2008. REUTERS/Laszlo Balogh (CHINA)

Teresa Frassinetti of Italy fights for the ball with Alison Gregorka (L) and Brittany Hayes of the U.S. (R) during their women's preliminary round Group A water polo match at the Beijing 2008 Olympic Games August 13, 2008. REUTERS/Laszlo Balogh (CHINA)

Alison Gregorka (L) of the U.S fights with Amanda Ortiz (4, hidden) of Puerto Rico during their water polo match at the Pan American Games in Rio de Janeiro, Brazil, July 18, 2007. REUTERS/Sergio Moraes (BRAZIL)

Alison Gregorka (top) of the U.S. and Gemma Hadley of Australia fight for the ball during their water polo gold medal match at the World Aquatics Championships in Melbourne March 31, 2007. REUTERS/Laszlo Balogh (AUSTRALIA)

Alison Gregorka (top) of the U.S. and Gemma Hadley of Australia fight for the ball during their water polo gold medal match at the World Aquatics Championships in Melbourne March 31, 2007. REUTERS/Laszlo Balogh (AUSTRALIA)

Alison Gregorka of the U.S (top) fights for the ball with Cristina Pardo Perarnau of Spain during their water polo quarter-final match at the World Aquatics Championships in Melbourne March 27, 2007. REUTERS/Laszlo Balogh (AUSTRALIA)

Alison Gregorka (R) of the U.S fights for the ball with Noeki Klein of the Netherlands during their preliminary water polo match at the World Aquatics Championships in Melbourne March 19, 2007. REUTERS/Laszlo Balogh (AUSTRALIA)