Mets LHP Steven Matz has excelled in 2018, but can he sustain it?Matz has a 3.31 ERA in 13 starts this season6/21/2018, 3:25 PMMaggie WigginJun 3, 2018; New York City, NY, USA; New York Mets starting pitcher Steven Matz (32) pitches during the first inning against the Chicago Cubs at Citi Field. Mandatory Credit: Anthony Gruppuso-USA TODAY Sports / Anthony Gruppuso