Gatlin scowls back as crowd vents

Justin Gatlin felt the full force of the crowd's ire on Sunday and scowled back in response before finishing second to Usain Bolt in the 100m final and miss out on becoming the oldest man to win the event.

The 34-year-old US sprinter, who has served two career doping suspensions, played the sullen yin to Jamaican superstar Bolt's exuberant yang, glowering both times he was introduced to boos as he entered the stadium.

"At the end of the day you hear everything, but you have to tune that kind of stuff out," Gatlin said.