Shelly-Ann Fraser-Pryce had not raced in the Diamond League in two years. Paul Chelimo had never won at an international meet.
Both grabbed wins at the first day of a Diamond League stop at the London Olympic Stadium on Saturday.
Fraser-Pryce, the two-time Olympic 100m champion who missed 2017 due to pregnancy, broke 11 seconds for the first time as a mother. She won in 10.98 seconds, edging American Dezerea Bryant by .06.
“I cannot complain because I haven’t raced for ages and I’m happy that the run today was under 11 seconds,” said Fraser-Pryce, who has raced in smaller meets this spring and summer.