White Sox Sign Kelvin Herrera as Relief Market Shrinks
The White Sox have made a series of minor moves this offseason to prepare themselves for contention at some point in the future; that might be as soon as next year, but it’s more likely in 2020 or later. The team added Ivan Nova from the Pirates to provide innings in the rotation. They added Alex Colome from the Mariners to help the pen. Chicago acquired Yonder Alonso from Cleveland to improve the offense and let Jose Abreu spend more time at designated hitter. If there was a $7 million to $10 million unwanted player, the White Sox have seemed willing to take on the salary in exchange for a fringe prospect. That strategy took on a different form today, as the team snapped up free agent reliever Kelvin Herrera on a two-year, $18 million deal with a vesting option, per Jeff Passan.
Herrera, not unlike many relievers, has had an inconsistent career. In 2012, 2014, and 2016, he put together very good seasons, with a sub-3.00 FIP and at least one win above replacement. In 2013 and 2015, he was closer to average. In 2017, when he took on closer duties in Kansas City, he just wasn’t very good. Last season, he put together a very good first half, which prompted Kansas City to trade him to Washington at just the right time. In DC, Herrera pitched poorly, and was sidelined with a rotator cuff injury and then a foot problem that ended his season. He’s missed time due to right arm injuries in 2014, 2017, and last year, also not uncommon for a reliever throwing in the high-90s. This is what his velocity looks like by season.
Velocity isn’t everything, and at 29 years old, Herrera is still young, but the drop is concerning. Here’s a similar graph showing his strikeout and walk rates.
Herrera’s walk rate has always been fine aided by a career 60% first strike rate, including 67% last year. It is interesting that his strikeout rate doesn’t necessarily correlate with his fastball velocity. He wasn’t striking out a lot of batters in 2014 and 2015, when he still had great velocity, and then when his velocity first dipped in 2016, he struck out batters at the highest rate of his career. In ranking the Top 50 free agents this offseason, Kiley McDaniel put Herrera 49th overall and 10th among relievers. McDaniel pegged Herrera for a one-year deal at nine million dollars, roughly half the guarantee he ended up receiving. Dan Szymborski wrote Herrera’s report in that post and came to a similar conclusion. Read the rest of this entry »