The outfielder was hitting .205 for the Mets after signing a one-year, $7.25 million deal with them last November. He also has eight home runs and 28 RBI in 88 games this season.
An All-Star in 2010 with the Diamondbacks, Young will now head to his fourth team in the last three seasons.
The 30-year-old last played in the minors in April, when he spent three games with the Mets' Triple-A squad.
- Molly Geary