HOUSTON -- Major League Baseball is working on a scheduling reconfiguration for the 2013 season and beyond that likely will eliminate the Mets and Yankees as well as other "natural rivals" playing home-and-home, six-game series annually, baseball sources told ESPNNewYork.com.
With the Houston Astros moving to the American League West next season and the leagues becoming balanced at 15 teams apiece, natural rivals throughout baseball no longer will be guaranteed six games a season and home-and-home series, the sources said.
The Mets and Yankees will continue to play six games a season -- three apiece at Citi Field and Yankee Stadium -- when the AL East and NL East line up for long-form interleague play every three years.
But in the other seasons, a major league source added, the competition likely will be limited to three games at one ballpark, or two games apiece at each ballpark.
Sources cautioned that the 2013 Major League Baseball schedule, and the precise new configurations, are still being discussed.
The Mets and Yankees annually have played three games apiece in the Bronx and Queens since 1999.
The rivalry typically has been a boon to attendance while also increasing the toughness of the New York teams' schedules relative to their division rivals.
While it increased the difficulty of the Mets' schedule, the Yankees annually playing three games a season at Citi Field has provided a boost to attendance and revenue.
The nine largest crowds at Citi Field during the first three seasons of the stadium's existence were the Yankees' nine visits to Queens -- an average of 41,513 tickets sold per game.
Since interleague play began in 1997, the Mets are 35-49 against the Yankees.