A Very Different Wei-Yin Chen
When the Marlins inked Wei-Yin Chen to a five year, $80 million deal this offseason they weren’t signing an ace or a workhorse. During his four previous seasons, Chen registered an ERA-, FIP-, or xFIP- better than 90 just once and he maxed out at 192.2 innings in 2012. Chen made a name for himself from 2012 to 2015 as an exemplar of consistency. Above average, but not great. Reliable, but not remarkable.
For $80 million, an opt-out clause, and a vesting option, the Marlins added someone worthy of slotting in behind Jose Fernandez without tying up significant payroll in one of the offseason’s superstar pitchers. Chen probably wouldn’t have been noticed walking down the street in any major-league city other than Baltimore, but front offices and coaching staffs certainly knew the value he could bring to one of those cities.
Yet the early returns on Chen have been somewhat disappointing for the Marlins. He’s running a career worst ERA-, FIP-, cFIP, and DRA over his first 15 starts of 2016. The only major run estimator by which he hasn’t suffered so far this year is xFIP-, which provides a very easy entry point into his struggles: it’s the home-run rate, mostly.
Chen’s never been known for his home-run prevention, registering a HR/9 above the MLB average in each of his major league seasons. Part of that has to do with pitching in Baltimore and in the AL East, but he’s someone who allows a greater share than most of batted balls in the air, and home runs can often come with that territory. This year, his home-run rate has increased at a rate even greater than the MLB average. Granted, the difference between his 2016 HR/9 and his career average HR/9 is something like four home runs over his 86.1 innings this year. Those four home runs happened, but it’s not like we’re looking at an Anibal Sanchez-level event here.