Second-seed Serena Williams demolished France's Julie Halard-Decugis in two sets on Sunday to win the $535,000 Toyota Princess Cup and add the icing to the cake after her gold medal in the Sydney Olympic doubles.

Williams recorded a 7-5, 6-1 victory at Tokyo's Ariake Colosseum, giving the 19-year-old American her third title of the season and a check of $87,000 to invest in the stock market -- her new hobby now that she has, apparently, cured her shopping bug.

The world No. 8 backed up her promise to serve better after Saturday's semifinal win against Czech qualifier Daja Bedanova and banged in 10 aces against the fourth-seeded Halard-Decugis, who failed to secure a single break point during the 65-minute match.