Undermanned Mets open series against hot Marlins

The first-place New York Mets, seemingly held together all year by a giant Band-Aid, are being tested again.

The visiting Mets, set to open a three-game series at the suddenly hot Miami Marlins on Friday, are especially vulnerable in their rotation. Four pitchers are hurt: Max Scherzer, Jacob deGrom, Tylor Megill and Carlos Carrasco.

On Friday, the Mets will start right-hander Taijuan Walker (5-2, 2.88 ERA).

Walker cou