The collective bargaining agreement between Major League Baseball and the players’ union expired at 11:59 p.m. ET on Wednesday, leading to the first official work stoppage in professional baseball since the 1994-95 seasons.The collective bargaining agreement between Major League Baseball and the players’ union expired at 11:59 p.m. ET on Wednesday, leading to the first official work stoppage in professional baseball since the 1994-95 seasons.