Kamworor also won the New York Marathon in 2019, having previously won in 2017.
Kenyan long-distance runner Geoffrey Kamworor has retired from the Tokyo Olympics with an ankle injury.
Kamworor, who was hoping to win a men’s 10,000m medal, confirmed the news to BBC Sport Africa and said he was “disappointed”.
The 28-year-old impressed at the Kenyan championships last month with a time of 27 minutes and 1.06 seconds, securing his Tokyo qualification.
It was the fastest time in Kenya over the distance.
Kamworor’s performance also signaled his return to top form after injuring himself in an accident last year when he was hit by a motorcycle during practice.
His manager Valentijn Trouw told the BBC he was sure Kamworor will be “stronger” back from this recent setback.
“His training was balanced and controlled. Those are obstacles that can come your way when you come back from a serious injury. Only now is the timing extremely bad.”
“If Geoffrey had challenges in his career, he always came out stronger. I am convinced that it will be the same this time,” added Trouw.
Kamworor, three-time world champion in the half marathon, won silver over 10,000 m at the 2015 World Championships in Beijing.
He’s also a former world record holder in the half marathon.