Wait, is Matt Harvey having worst season by a Mets starter ever?
In his first three seasons in the majors he was below 3.00 ERA each time. he ballooned to 4.86 last year and an egregious 6.59 this year. Through 2015 he had allowed 7.0 hits per 9 innings. The past two years he has been up to 10.7.
In 2014 he had Tommy John surgery, but seemed to have fully recovered from that in 2015. More recently, he has been struggling with something called thoracic outlet syndrome, which has required more surgery.