- Rosters will increase from 25 to 26 through August 31 (with the likely cap being 13 pitchers) and to 28 in September (likely 14 pitchers).
Mound visits per team will be reduced from six to five.
Voting for the All-Star Game - this year's game will be held at Progressive Field on July 9 - will be conducted in two rounds.
Major League Baseball and the MLBPA have spent this past winter negotiating over rule changes while labor relations grew tense after a second consecutive slow free agent market.
Players can be placed and claimed on outright waivers, but there will be no trades after July 31. The top three voter-getters at each position will receive bonuses of $2,500 to $15,000, which will not count against a team's luxury-tax payroll.
As for the All-Star game, fans will still vote online for the All-Star starters, but the top three vote-getters will have a one-day election for selection of players.
Small changes are coming to Major League Baseball this season with bigger ones arriving in 2020 the league announced Thursday.
Home Run Derby: Total player prize money for the Home Run Derby will be increased to $2.5 million. Additionally, the prize money awarded to players on the winning All-Star team will be increased beginning with the 2019 All-Star Game.
If the All-Star Game goes to extra innings, each half inning will begin with a runner on second base.
Major League Baseball is looking to spice up the Home Run Derby and thinks they've found a way. From that point on, rosters can expand to 28 players and 14 pitchers.
While commissioner Rob Manfred has staunchly dismissed suggestions that a significant portion of the league is no longer attempting to win, players and Union officials have decried widespread tanking/rebuilding efforts that have created decreasing levels of parity and discouraged teams from venturing into free agency amid record MLB revenues.
-As part of the drop in the September roster limit, players may be optioned to a team's spring training facility from Sept. 1 on. A committee between the sides that will study the game is expected to make recommendations on the maximum number of pitchers allowed on the rosters. Teams will be required to designate players as a pitcher or position player before each player's first day on the active roster. That might be the more notable change since teams could previously use up to 40 players in a given September game.
Starting and relief pitchers must pitch to either a minimum of three batters or at the end of half inning. The joint announcement only says the MLBPA "will not grieve or otherwise challenge" the rule change in 2020. As part of the recent agreement, both the league and the Union have already agreed to "imminently" begin discussing the labor issues that have been thrust to the forefront of the industry despite the fact that the current collective bargaining agreement doesn't expire until 2021.
Injured List and Option Period for Pitchers: Subject to input from the joint committee, the minimum placement period for pitchers on the Injured List shall increase from 10 days to 15 days, and the minimum assignment period of pitchers who are optionally assigned to the minors will increase from 10 days to 15 days.