The 2015 New York Mets season was the 54th season in the franchises' history. The Mets finished the regular season with a record of 90–72, winning the National League East title on September 26, their first division title since 2006 and sixth overall. They defeated the Los Angeles Dodgers in the NLDS in five games and swept the Chicago Cubs in the NLCS. They lost to the Kansas City Royals in five games in the 2015 World Series. It was the Mets' first appearance in the World Series since 2000 when they lost to the New York Yankees. It marked the team's first winning season since Citi Field opened in 2009.

The 2015 Chicago Cubs season was the 144th season for the franchise, the 140th in the National League and the 100th at Wrigley Field. The Cubs were managed by Joe Maddon in his first year as Cubs manager and played their home games at Wrigley Field as members of the National League Central.