Kerron Clement of U.S. wins men's 400m hurdles

Kerron Clement of U.S. wins men's 400m hurdles

OSAKA, Japan - Kerron Clement of the United States celebrates after winning the men's 400-meter hurdles at the World Athletics Championships at Nagai Stadium in Osaka on Aug. 28. Clement won the gold in a time of 47.61 seconds.

Kerron Clement of U.S. wins men's 400m hurdles

Kerron Clement of U.S. wins men's 400m hurdles

OSAKA, Japan - Kerron Clement of the United States clears a hurdle on his way to winning the men's 400-meter hurdles at the World Athletics Championships at Nagai Stadium in Osaka on Aug. 28. Clement won the gold in a time of 47.61 seconds. (Pool photo by Kyodo News)

Tsukahara claims men's 100 meters at Osaka Grand Prix

Tsukahara claims men's 100 meters at Osaka Grand Prix

OSAKA, Japan - American Kerron Clement takes the victory in 48.60 seconds in the men's 400-meter hurdles at Osaka Grand Prix at Nagai Stadium on May 9.

Kerron Clement of U.S. wins men's 400m hurdles

Kerron Clement of U.S. wins men's 400m hurdles

OSAKA, Japan - Kerron Clement of the United States celebrates after winning the men's 400-meter hurdles at the World Athletics Championships at Nagai Stadium in Osaka on Aug. 28. Clement won the gold in a time of 47.61 seconds. (Kyodo)

Kerron Clement of U.S. wins men's 400m hurdles

Kerron Clement of U.S. wins men's 400m hurdles

OSAKA, Japan - Kerron Clement of the United States clears a hurdle on his way to winning the men's 400-meter hurdles at the World Athletics Championships at Nagai Stadium in Osaka on Aug. 28. Clement won the gold in a time of 47.61 seconds. (Pool photo by Kyodo News)

Tsukahara claims men's 100 meters at Osaka Grand Prix

Tsukahara claims men's 100 meters at Osaka Grand Prix

OSAKA, Japan - American Kerron Clement takes the victory in 48.60 seconds in the men's 400-meter hurdles at Osaka Grand Prix at Nagai Stadium on May 9. (Kyodo)

Kenya's Bett wins 400-meter hurdles at world meet in Beijing

Kenya's Bett wins 400-meter hurdles at world meet in Beijing

Kenya's Nicholas Bett (L) competes in the men's 400-meter hurdles final at the IAAF World Championships in Beijing on Aug. 25, 2015, as Kerron Clement of the United States trails him. Bett won the race in 47.79 seconds, the world's best this year. (Kyodo) ==Kyodo

Clement wins gold in men's 400m hurdles

Clement wins gold in men's 400m hurdles

Kerron Clement of the United States (front) wins the gold in the men's 400-meter hurdles at the Rio de Janeiro Olympics on Aug. 18, 2016. (Kyodo) ==Kyodo