Before throwing the ball back to the pitcher you must assess the situation, maybe you can run fast enough with the ball and reach the base or home plate before the runner.
Baseball is a game that requires players to bat as well as field. This means that players need to show their skills both as hitters and as fielders.
Speed plays a significant role in baseball. The tradition of recruiting players based on their 60-yard dash running speed is still used in an MLB tryout camp. The fastest runners are selected with some other usual documentation.