RulesMLB Umpire Manual
FLY BALL STRIKING TOP OF OUTFIELD WALL
Rule 5.05(a): Unless provided otherwise by local ground rule, a fair fly ball striking the top of the outfield wall and bounding back onto the playing field shall be treated the same as a fair fly ball that strikes the outfield wall and rebounds back onto the playing field (in play but may not be…
RulesMLB
4.05 (3.13) Special Ground Rules
The manager of the home team shall present to the umpire-in-chief and the opposing manager any ground rules he thinks necessary covering the overflow of spectators upon the playing field, batted or thrown balls into such overflow, or any other contingencies. If these rules are acceptable to the opposing manager they shall be legal. If these rules are unacceptable to…