LONDON—Hitomi Obara of Japan won her first Olympic gold medal in women's 48-kilogram freestyle wrestling Wednesday, rallying to beat Mariya Stadnyk of Azerbaijan 0-4, 1-0, 2-0.

Obara has won six world titles at 51 kilograms, a non-Olympic weight, and took the last two world titles at 48 kilograms.

Stadnyk, the bronze medalist in Beijing, also lost to Obara in the 2011 world championship final.

Carol Huynh of Canada and Clarissa Chun of the United States won bronze, with Chun giving the U.S. its first wrestling medal of the London Games.