Athletes compete in the Women's 100 metres hurdles semi finals on Day 12 of the Rio 2016 Olympic Games at the Olympic Stadium on August 17, 2016 in Rio de Janeiro, Brazil.

Brianna Rollins of the United States (R) crosses the finish line to win gold in the Women's 100m Hurdles Final on Day 12 of the Rio 2016 Olympic Games at the Olympic Stadium on August 17, 2016 in Rio de Janeiro, Brazil.

Athlets start the Women's 100m Hurdles Final on Day 12 of the Rio 2016 Olympic Games at the Olympic Stadium on August 17, 2016 in Rio de Janeiro, Brazil.

Brianna Rollins of the United States (6) crosses the line to win gold in the Women's 100m Hurdles Final on Day 12 of the Rio 2016 Olympic Games at the Olympic Stadium on August 17, 2016 in Rio de Janeiro, Brazil.

Brianna Rollins of the United States (L) wins the gold medal in the Women's 100m Hurdles Final ahead of silver medalist Nia Ali of the United States and bronze medalist Kristi Castlin of the United States on Day 12 of the Rio 2016 Olympic Games at the Olympic Stadium on August 17, 2016 in Rio de Janeiro, Brazil.

(L-R) Bronze medalist Kristi Castlin, gold medalist Brianna Rollins and silver medalist Nia Ali of the United States celebrate with American flags after the Women's 100m Hurdles Final on Day 12 of the Rio 2016 Olympic Games at the Olympic Stadium on August 17, 2016 in Rio de Janeiro, Brazil.