Confirming previous reports, union chief Michael Weiner told reporters in Kansas City the Mets and Yankees and other interleague rivals will play three or four games beginning in 2013, not six.

"It wasn't fair to have six games against an opponent that other teams in your division didn't," Weiner said at a Baseball Writers' Association of America gathering. "The Mets, for example, would say `Why do we have to play the Yankees six times every single year when some of our division opponents are playing teams that aren't traditionally as strong? We understand we've got to play the Yankees every year. That's OK. Why should we play six?'"

Via the Associated Press:

Teams in a division will play three games each against teams in another division: for example, the NL East vs. the AL Central. The interleague rivalries will be either one three-game series or a home-and-home of two games each, Weiner said. There will be an exception in years the rivals play the opposite division -- for instance, the Yankees and Mets would play six times in years the NL East plays the AL East.

Baseball's new labor contract says teams will play up to 20 interleague games a year. Weiner says the total is likely to be close to the maximum. "It may be that you can come up with a more workable schedule by moving up to the higher end of the interleague play range as opposed to the lower end," he said. "So it's not a question that 19 or 20 is much better than 18 in terms of interleague play, it's a question of how to put the pieces of the puzzle together."

A draft schedule has been given to the union, which is studying it before MLB finalizes it ahead of an anticipated September release. Because of the two 15-team leagues, two clubs will have to open and close with interleague games.