Los Angeles: World 100 metres silver medallist Christian Coleman opened his 2018 campaign by breaking the 60-metre indoor world record on Friday at the Clemson Invitational track meet.

The 21-year-old American charged to victory in the final in 6.37 seconds to surpass the previous record of 6.39 held by countryman Maurice Greene. Greene ran the time twice, in 1998 in Madrid, and in 2001 in Atlanta, Georgia.

Coleman’s previous best was 6.45 seconds at last year’s US collegiate indoor championships. The meet at Clemson University in South Carolina was the first event of the season for Coleman. Earlier in the day he ran a time of 6.47 seconds.