It’s thought to be because the biceps femoris muscle exerts more force than the other hamstring muscles in sprinting. The long head of the biceps femoris is particularly prone to injury.

The biceps femoris and semitendinosus engage in complex synergistic activation patterns during heavy eccentric loading, in which the semitendinosus has a predominant function and elicits the highest ...

"Following tests carried out today by Real Madrid's Medical Services on our player Kylian Mbappé, he has been diagnosed with an injury to the biceps femoris in his left leg.