Former Olympic champion Justin Gatlin, rebuilding a career shamed by a four-year doping ban, edged Britain's Dwain Chambers in the 100m at the Madrid athletics meeting.
US sprinter Gatlin clocked 10.10sec to beat Chambers (10.13sec) with America's Travis Padgett (10.18sec) claiming third place.
Gatlin was suspended for four years after testing positive for testosterone just three months after equalling the world 100m record in 2006.
Ironically, Chambers also served a doping ban, in his case for two years in 2003.
Gatlin's four-year suspension saw him plummet from sprinting's pinnacle to athletics wilderness, but he rebounded to make the US team for the 100m at next month's world championships in Daegu, South Korea.
His dope test failure in 2006 was considered a second offence, following a 2001 violation for a banned stimulant, resulting in a longer ban.