Jozef Metelka of Slovakia reacts as he crosses the finishing line during the men's C4 4km individual pursuit gold medal final of the 2018 Para-cycling Track World Championship at the Olympic Park velodrome in Barra, Rio de Janeiro, Brazil, on March 24, 2018. Jozef Metelka took the gold by defeating Kyle Bridgwood of Australia with 4 minutes and 30.584 seconds. (Xinhua/Li Ming)