The mother of a teenager who ran onto the field at a Philadelphia Phillies baseball game, where he was tasered, has apologised for her son's actions.

Amy Ziegler told media that her 17-year-old son, Steve Consalvi, regretted running onto the field on Monday night.

Consalvi hopped a fence and scurried around the outfield, eluding two security officers in the bottom of the eighth inning against the St. Louis Cardinals.

One officer used a Taser and the Consalvi fell down in a heap.

Consalvi is a high school senior from the suburb of Boyertown.

Philadelphia Police Commissioner Charles Ramsey has concluded the officer acted within department guidelines, which allow officers to use tasers to arrest fleeing suspects.