ASA Fastpitch Softball Rules | SportsRec Players and PositionsEquipment and UniformsBoundaries and Base PositionsLength of Game PlayField positions in fastpitch softball total nine. The right fielder, center fielder and left fielder cover the outfield. The infield is covered by the catcher, pitcher, shortstop and three basemen. One baseman each covers the first three bases and the catcher covers home plate. In some leagues, a tenth player can be added to the roster as the designated batter, and replaces the pitcher at bat.See more on sportsrec[PDF] OFFICIAL RULES OF SOFTBALL - baseball-softball Wherever “FAST PITCH ONLY (FP ONLY)” appears in the Official Rules, the same rules apply to Modified Pitch with the exception of the pitching rule. "Any reprinting of THE OFFICIAL RULES without the expressed written consent of the International Softball Federation is strictly prohibited."