On the surface Gregory Polanco appears to be having a fairly average sophomore season. Through 30 games Polanco is slashing a pedestrian .271/.320/.381. That is just a .702 OPS. Former Pirates RF Travis Snider, who Polanco replaced, has a .749 OPS this season with the Orioles. But Polanco packs some serious extra value to his game. That value can be found on the base paths.
Fangraphs rates Polanco as the second best baserunner in the National League this season with a BsR of 2.7. Only Billy Hamilton has contributed more value on the base paths in 2015.