RIO DE JANEIRO (AFP) - Judoka Rafaela Silva upset world No. 1 Sumiya Dorjsuren to win hosts Brazil's first gold medal of the Rio Games on Monday.

Silva, who also won the world title on home soil in 2013, sunk to her knees after winning the under-57kg final with a half point waza-ari score from a leg reap counter attack, before leaping into the stands to hug her supporters.

London champion Kaori Matsumoto of Japan took bronze alongside five-time European champion Telma Monteiro of Portugal.