PHILADELPHIA - During the season's first half, Eric Campbell gave the Mets a valuable platoon bat off the bench, a weapon for manager Terry Collins to deploy against lefthanders.
But like many of his teammates, Campbell has stumbled out of the gate in the second half, hitting .136 (3-for-22) entering Saturday night against the Phillies.
Collins said Campbell found early success by hitting to all fields, which has gotten away from him since the All-Star break.
Said Collins: "It looks like he's in the pull mode a little bit."
Still, Campbell will continue to see regular playing time against lefthanders, though in a different defensive position.
Campbell had formed a platoon at first base with Lucas Duda, who has enjoyed a breakout season despite his struggles against lefties (.149). But with Duda set to face more lefties, Campbell instead will share time in leftfield with Matt den Dekker.
Campbell will step in for Chris Young, whom the Mets designated for assignment Friday.
Closer Jenrry Mejia was unavailable Saturday night, sidelined by his recent workload and lingering tightness in his right calf.
"He's fine," Collins said. "But I'm not going to pitch him. He's going to need a day."
Mejia has thrown only 28 pitches in his last two appearances but was forced to negotiate trouble both times.
Rehabbing ace Matt Harvey threw 29 pitches off the slope of the mound Saturday, the club announced.
The righthander remains at the team's complex in Port St. Lucie, Florida, where he arrived earlier in the week to continue his throwing sessions off the mound.
Reliever Bobby Parnell played catch for the first time since having Tommy John surgery in April.
Righthander Daisuke Matsuzaka (elbow inflammation) threw 38 pitches in a bullpen session.