Chris Young’s underachieving era with the Mets ended Friday night, when the veteran outfielder was designated for assignment.

Following the Mets’ 5-4 victory over the Phillies at Citizens Bank Park, manager Terry Collins and general manager Sandy Alderson informed Young he was out.

“At some point you have to move on, and I think this was about the time to do that,” Alderson said. “I’ve liked Chris a lot since the first time I met him, and unfortunately it didn’t work out completely as we would have liked, so it’s time to move on to something else.”

Alderson signed Young to a one-year deal worth $7.25 million last offseason and promised him regular playing time. But Young became symbolic of the team’s offensive woes, batting only .205 with eight homers and 28 RBIs in 254 at-bats.

Matt den Dekker, who entered Friday leading the Pacific Coast League in hitting, was recalled from Triple-A Las Vegas to take Young’s roster spot and is expected to become the regular left fielder.

Young, who did not play Friday, said he understood the decision.