The Mets released Rosario on Sunday, Will Sammon of The Athletic reports.
Rosario has now parted ways with three teams in the National League East this season alone, as he was previously cut loose by Washington and Atlanta. Unlike those previous two stops, Rosario never received a look at the big-league level with the Mets, as he was assigned to Triple-A Syracuse upon signing with the organization on a minor-league deal earlier this month. He saw action in seven games for Syracuse, slashing .103/.133/.310 with eight strikeouts in 30 plate appearances.