2010 USSSA Fast Pitch Rules
This is intended as quick summary of areas of significant differences in USSSA Fast Pitch rules.

Players shall not use other teams on deck circle. USSSA 1.2.A

The Mercy Rule is 12 runs after 3 innings, 10 runs after 4 innings, or 8 runs after 5 innings. USSSA 4.4

One or two Additional Player(s) may be used. USSSA 5.3 {10 or 11 in batting order; 9 defensive fielders}

If using the Designated Hitter and Defensive Player, the DH may play defensive or the DP may play offensive in either case the DH role is terminated for game USSSA 5.4

A player may be removed as a pitcher and returned as a pitcher only once per inning. USSSA 5.5.B

All Starters & Substitutes may re-enter USSSA 5.6

A team may use 3 defensive conferences per game plus 1 per extra inning; pitcher removed as a pitcher for game. USSSA 4.8.A

The pitcher must start with her Pivot foot on rubber; her non pivot may be in contact or behind. USSSA 6.1

Pitching distance is 43 feet for 16U & 18U. AND 14U in 2011.

A team may use a courtesy runner for the pitcher or catcher. It must be a player who has not been in game (except as a courtesy runner). The player may not for be used for both positions in same inning. A courtesy runner may not be used for the DP. USSSA 8.3

If the courtesy runner is injured, another courtesy runner or the pitcher or catcher may run for her. USSSA 8.3.E

After reaching First, may use either white or orange portion of the double first base. 8.19

10&Under - same playing rules as other classifications