Only Major League Baseball player ever to do this

[Zambero]

2. Forbes Field had deep left field and center field dimensions

As I recall, something on the order of 450 feet to the CF wall or more. If an outfielder was situated shallow enough, a deep line drive could roll to the wall, and it could require several seconds for the ball to be retrieved. Also, given distance it would have been difficult, if the fielder was not Roberto Clemente himself, to get the ball directly back to home plate in time to throw a batter running at full tilt out at the plate. In this instance, the batter/runner was faster than the relay.