NEW YORK (AP) — Major League Baseball plans to unilaterally issue a 60-game schedule for its shortest season since 1878 after the players’ association rejected a negotiated deal of the same length, putting the sport on track for a combative and possibly unhappy return to the field amid the coronavirus pandemic.

Six days after baseball Commissioner Rob Manfred and union head Tony Clark negotiated to expand the playoffs from 10 teams to 16, widen use of the designated hitter to National League games and introduce an experiment to start extra innings with a runner on second base, the deal was rejected by the Major League Baseball Players Association’s executive board in a 33-5 vote.

“To that end we anticipate finalizing a comprehensive set of health and safety protocols with Major League Baseball in the coming days, and we await word from the league on the resumption of spring training camps and a proposed 2020 schedule,” the union said.

An initial deal March 26 called for players to receive prorated salaries and gave Manfred power to set the schedule, but that agreement did not require MLB to play in empty ballparks.

Players are expected to file a grievance, claiming MLB violated a provision in the March agreement requiring both sides to “work in good faith to as soon as is practicable commence play, and complete the fullest 2020 championship season and postseason that is economically feasible” consistent with several provisions.