Resources for Umpires

Welcome Umpires!

Welcome Umpires!

Your Director is John Serrato and he can be reached at

Note: New and returning BYBA umpires should make plans to attend the following training classes.  All boys and girls 10 years old or older are invited to attend the classes to become eligible to umpire in BYBA for the upcoming 2018 season.

To register for the training classes, umpires are required to complete the registration form which can be found  here:

Download Umpire Documents Below:


UPDATED 4.29.19

BYBA LEAGUE RULES_Spring 2019_v5[1]



BYBA Umpires Manual 1-22-19
Umpire Positioning



2019 League Rules


A player registered in BYBA may not play in another baseball league or on another organized baseball team during the BYBA regular season which runs from approximately mid-February through the end of May.  A player registered in BYBA may play on their regular season team at the same time as a BYBA tournament team or the Burlingame Cooperstown team, which may hold practices but not play games during the last month of the BYBA regular season.  Additionally, a BYBA player who is playing on a BYBA tournament team may not play on another organized baseball team during the summer season.

Baserunners must slide or avoid contact.  If umpires determine the contact was intentional, the baserunner is out and all other runners return to the base they last occupied.  No penalty for incidental contact.

If a player is removed for injury, player may not re-enter the game if doing so puts the player in immediate danger of further injury.  The player’s coach will make the decision.

No metal spikes.

No head-first slides allowed at any base.  No warnings.  Penalty, runner is out.  All runners retain base they last occupied.  Head-first slides back to a base are allowed.

Suicide squeeze plays are not allowed.  No warnings will be issued.   Penalty: Runner on 3rd base is out, all runners return to their base, and there is no pitch.

No straight steal of home. No warnings.  Penalty, runner from 3rd base is out.  No pitch.  Following runners maintain the base they last occupied.

Time (Mudville, Reyna and Sauer)

The first three (3) games of the season will be considered pre-season games and the results will not count towards standings used for playoff seedings.

The home plate umpire will keep official game time.  No extra innings will be played regardless of time.  If game is tied after the final inning, the game ends in a tie.  This extra innings rule does not apply during the playoffs.  During the playoffs, if a game is tied when time has expired, then the next inning will be started with runners on first and second base.  The runners will be the last two outs in the previous inning.  If after two additional innings in this format there is no winner then the game will stop and the game will be decided by a tie breaker of head to head competition during the regular season and then if necessary, by run differential during the regular season (the tie breaker does not apply in the championship game).

Courtesy runners are allowed for the catcher with two (2) outs.  The courtesy runner will be the player who made the last out.

Pitching (Mudville, Reyna and Sauer) 

The pitcher must be changed on the second visit to the mound by a coach in an inning.  An official visit occurs when a coach calls time-out to talk with the pitcher or goes onto the field to talk with the pitcher without calling time-out.  A visit can occur even if a coach does not go across the foul line to confer.  A visit can be called by an umpire if any defensive coach talks directly to the pitcher or to any defensive player who then talks to the pitcher, with or without calling time-out.  If manager calls time-out and meets with any defensive player, it is a charged visit.  If the defense meets when the offense calls time-out, it is not a visit if they break up immediately after offense breaks up.

Pitchers are allowed a maximum of 7 warm-up pitches to start the game and 6 pitches between innings.  A maximum of 6 warm-up pitches are allowed for relief pitchers.

Once a pitcher has been removed from pitching, they cannot re-enter the game as a pitcher.

Each team shall designate a representative to count each pitcher’s number of pitches thrown in a game and both coaches shall confirm the number of pitches after each inning. BYBA umpires will not be responsible for tracking pitches thrown by the pitchers.  In the event of a disputed pitch count, the home team’s count shall apply.

If a pitcher reaches a day(s) of rest threshold while facing a batter the pitcher may continue to pitch until one of the following conditions occurs:  1) the batter involved reaches base; 2) the batter is put out; 3) the out is made to end the involved players at bat.  If an out is made to end the inning and the batter will return as the first batter for the next inning (e.g., a pickoff out that ends the inning), the pitcher shall not return to face that same batter.

For example, it a pitcher was at 19 pitches at the start of the at-bat, and finished the at-bat with 23 pitches, the pitcher would not be required to observe any days’ rest because pitcher only reached the first (1-20 pitch) threshold.

The rest period starts the day after a player pitches his last pitch.  For example, if a player pitches 25 pitches in his 9-11am Saturday game, he must rest the entire day on Sunday and is not eligible to pitch again until Monday.  It would not matter if the player had a game after 11am on Sunday.

Balks will be called in Reyna and Sauer, except for pre-season games when no balks shall be called. Umpires will provide one warning to each team.  On the balk warning, the play is dead and the pitch will not be counted.  On a called balk, the team at bat can take the result of the play if the pitch on which the balk was called is safely put in play. No warnings will be issued for balks during the playoffs.

No intentional walks.

Roster (Mudville, Reyna and Sauer)

Continuous batting order with no changes allowed during the game.

If a roster player leaves the game early, the player’s spot is skipped and no out is recorded.  This also applies to call-up players.

Defensive substitutions are allowed at any time.  Players may not sit out more than 6 defensive outs per game.  In Sauer, players may not sit out more than 6 defensive outs at a time or more than 9 defensive outs per game.

Call-ups should be used if fewer than 9 players are going to be available for a game (10 players in Mudville). Call-ups may play any outfield position and must bat at the bottom of the order.  If an unexpected roster player(s) makes the game, let the call-up player(s) play but follow the batting and defensive requirements.  Call-ups may be allowed during playoffs, subject to league director approval.

If a roster player arrives late to the game, he must enter at the bottom of the order.  If the player arrives before his spot in the lineup has come up, he resumes his place in the order.  If call-ups are in the batting order, the late arriving player bats after the call-ups if they have already batted.  If the call-ups have not yet batted, the late arriving player bats after the last roster player in the batting order if the late arriving player’s spot has been passed, followed by the call-ups.


All teams will qualify for league playoffs.  The playoff schedule will be determined by each team’s regular season won-loss record. Tiebreakers will be decided by head-to-head record or a coin flip (in that order).  There are no playoffs in the Rookie league.

Bat Rules

Sauer (14U)

Any bats that meet CIF baseball bat standards (see which are BBCOR approved. The BBCOR stamp must be affixed to the bat. This category must follow a -3 weight to length ratio as described in the BBCOR approved baseball bats list. In summary, any BBCOR stamped and approved bat with a -3 weight to length ratio, whether “all aluminum” alloy or composite is allowed.

Any “all aluminum” alloy baseball bats are allowed (regardless of weight to length ratio). Any USABat certified bats bearing the USABat licensing mark are allowed.

Bats with a barrel larger than 2-5/8” and any composite bats that are not BBCOR -3 are not allowed (e.g., -10 Mako).


Interested in being a BYBA umpire?

Fill out the form below to sign up and we will contact you!