Justin Masterson threw 104 pitches last night and 103 of them were fastballs

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Justin Masterson shut out the Twins for 7.2 innings last night, allowing just four hits and no walks while striking out six, and remarkably did so while throwing fastballs on 103 of his 104 pitches. Seriously.

His timing was especially amusing because just a few hours earlier Sam Miller wrote a Baseball Prospectus column about all-fastball repertoires and wondered how long it would be before someone went with 100 percent heat in a start.

Masterson was damn close, throwing just one slider among 104 offerings, and Jordan Bastian of MLB.com (at the Twitter urging of an intrigued Miller) talked to the right-hander about why he bothered using the one non-fastball:

Well, you know, we thought we’d probably use it more. That one would hopefully kind of put it in the back of the head like, “Oh, later on in the innings, is he going to throw one here? Is he not?”

Along with that little intro to Game Theory he also said the approach was a case of “don’t change what’s working.” In other words, if the Twins kept showing that they couldn’t hit his fastball why did he need to throw anything else? Masterson got six strikeouts and 15 ground-ball outs while allowing zero extra-base hits, and only a Chris Perez blown save kept him from winning a 1-0 game while throwing one pitch slower than 90 miles per hour.

I’ve been skeptical of Masterson as a starter because I wondered if his lack of secondary pitches would eventually force a move to the bullpen, but that looks kind of silly right now. He has a 2.64 ERA and 101/40 K/BB ratio in 136 innings spread over 20 starts this season and, as Bastian notes, he’s thrown 82 percent fastballs.

Diamondbacks, T.J. McFarland avoid arbitration

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Bob Nightengale of USA TODAY Sports reports that the Diamondbacks and reliever T.J. McFarland have avoided arbitration, agreeing on a $1.45 million salary for the 2019 season. McFarland, in his third of four years of arbitration eligibility, filed for $1.675 million while the Diamondbacks countered at $1.275 million. McFarland ended up settling for just under the midpoint of those two figures.

McFarland, 29, was terrific out of the bullpen for the D-Backs last season, finishing with a 2.00 ERA and a 42/22 K/BB ratio in 72 innings. While the lefty may not miss a lot of bats, he does induce quite a few grounders. His 67.9 percent ground ball rate last season was the third highest among relievers with at least 50 innings, trailing only Brad Ziegler (71.1%) and Scott Alexander (70.6%).

McFarland was dominant against left-handed hitters, limiting them to a .388 OPS last season, but the D-Backs deployed him nearly twice as often against right-handed hitters, who posted an aggregate .764 OPS against him. It will be interesting to see if the club decides to use him more as a platoon reliever in 2019.