Stanford grad Melissa Seidemann scored a pair of goals and the United States women's senior national water polo team drenched South Africa, 18-1, on the first day of the FINA World Cup in Khanty-Mansiysk, Russia on Tuesday.
The Americans take on Australia, one of the two teams to beat the U.S. this season, in Wednesday's preliminary round action.
USC grad Kami Craig scored four goals to lead Team USA, which scored the game's first 15 goals.
Sacred Heart Prep and UCLA grad KK Clark also scored for the Americans as did Cardinal grad Annika Dries, senior Kiley Neushul and junior Maggie Steffens.
South Africa scored its only goal with 6:45 remaining to play in the contest.
In other first-round action, Spain swamped Singapore, 34-3, Australia topped Hungary, 10-7, and China edged host Russia, 14-13.
The U.S., coached by Adam Krikorian, is looking to defend its title and become the first repeat champion in 15 years.
Stanford grad Nicole Gibbs dropped her first-round match at the Western and Southern Open in Cincinnati to fellow American Christina McHale, 4-6, 6-3, 6-1, on Tuesday.
Gibbs, ranked a career-high 141st, was making her main draw debut in her hometown tournament.