On August 13, 2015, the Yankees announced that they would promote Bird to the major leagues, serving as a backup to Mark Teixeira at first base and Alex Rodriguez at designated hitter.
He made his major league debut that night, going 0-for-5.
He collected his first hit on August 15, a single off of Toronto Blue Jays reliever LaTroy Hawkins.
Teixeira injured his leg during a hit-by-pitch on August 17, which was later diagnosed as a season-ending shin fracture.
As a result, Bird became the Yankees' starting first baseman for the rest of 2015.

On August 19, Bird hit his first two MLB home runs off of Minnesota Twins pitcher Ervin Santana.
On September 7, Bird hit a go-ahead three-run home run in a game against the Baltimore Orioles.
On September 22, Bird hit a game winning three-run home run against the Toronto Blue Jays in the top of the tenth inning.
He finished the season with a .261 batting average and a .343 on-base percentage.
In 46 games and 157 at-bats, Bird hit 11 home runs with 31 RBIs.
On August 13, 2015, the Yankees announced that they would promote Bird to the major leagues, serving as a backup to Mark Teixeira at first base and Alex Rodriguez at designated hitter. He made his major league debut that night, going 0-for-5. He collected his first hit on August 15, a single off of Toronto Blue Jays reliever LaTroy Hawkins. Teixeira injured his leg during a hit-by-pitch on August 17, which was later diagnosed as a season-ending shin fracture. As a result, Bird became the Yankees' starting first baseman for the rest of 2015.
On August 19, Bird hit his first two MLB home runs off of Minnesota Twins pitcher Ervin Santana. On September 7, Bird hit a go-ahead three-run home run in a game against the Baltimore Orioles. On September 22, Bird hit a game winning three-run home run against the Toronto Blue Jays in the top of the tenth inning. He finished the season with a .261 batting average and a .343 on-base percentage. In 46 games and 157 at-bats, Bird hit 11 home runs with 31 RBIs.
Greg Bird (baseball)