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Justin Gatlin finished a 100m race limping and holding his forearm just 3 weeks.
The 37-year-old American left the trail encouraged with a fellow athlete after finishing fourth 10.29 minutes from the Croatian capital Zagreb.
Compatriot Michael Rodgers won the race in the IAAF World Challenge assembly in a wind-assisted 10.04.
Gatlin (9.87) gets the fourth fastest time in the world this season.
Fellow American Christian Coleman was fastest in 2019 with 9.81 minutes and is free to run at Doha after potential charges for missing three drugs evaluations were dropped.
Coleman was second at the 2017 World Championships supporting Gatlin, the 2004 Olympic 100m winner who served a ban between 2006 and 2010.
In Croatia, Gatlin – who is currently expecting to compete next year – winced in pain at around the 80m mark.
Lady Erika Rosenbaum explains her experience
It has among the widest ranges of choice from leaps, in sport and cries to sprints or space and cross country running.
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