NEW YORK - Opening Day for the New York Yankees and Mets has arrived.

The Yanks open at home in the Bronx against the Orioles.

Mariano Rivera will throw out the ceremonial first pitch.

Manager Aaron Boone announced his starters, but not the batting order.

Greg Bird will play first base and Luke Voit will be the DH.

Masahiro Tanaka goes to the mound opposite Andrew Cashner.

Reigning Cy Young Award winner Jacob deGrom will start the Mets opener in Washington.

It comes just days after he signed a five-year, $137 million contract extension.

He goes up against Max Scherzer - a two-time Cy Young winner and runner-up last season.

Top prospect Pete Alonso is expected to make his major league debut at first base in the team's opener.

First pitch in both games is just after 1 p.m.