NEW YORK — The 2018 Major League Baseball season will begin on March 29, the earliest start in the sport’s history excluding international openers.

All teams will play on opening day for the first time since 1968, the last year before the American and National Leagues split into divisions, the commissioner’s office said Tuesday.

As part of the sport’s new labor contract, each team’s 162 games were scheduled over 186 days, up from 183. The change was made to create more off days.

Previously, the earliest start except for international games was March 30 in 2003, 2008 and 2014. This will be just the 12th season to start on a Thursday following 1901-04, 1907, 1912, 1959, 1973-74, 1976 and 2011.

Pittsburgh at Detroit is the lone interleague opener. The NL schedule has Colorado at Arizona, Philadelphia at Atlanta, Washington at Cincinnati, San Francisco at the Los Angeles Dodgers, the Chicago Cubs at Miami, St. Louis at the New York Mets and Milwaukee at San Diego.

The All-Star Game is July 17 at the Nationals.