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.

Padres, Mariners join list of teams to extend netting

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The Reds announced earlier that they plan to extend the protective netting at Great American Ball Park in time for Opening Day next season. You can add the Padres and Mariners to what will surely be a growing list.

A young fan was struck in the face by a foul ball at Yankee Stadium on Wednesday, which gave new life to the netting debate. Some fans and media types think Major League Baseball is not doing enough to protect fans. While Major League Baseball has issued guidelines for protective netting, it is ultimately up to the teams to decide just how much netting to use.

Zach Britton receives stem cell injection, likely done for the season

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Orioles closer Zach Britton is likely done for the remainder of the 2017 season after receiving a stem cell injection in his left knee, Peter Schmuck and Jon Meoli of the Baltimore Sun report. Britton has been battling knee problems for most of the season.

The Orioles are still technically in the AL Wild Card race, entering play Thursday 5.5 games behind the Twins for the second Wild Card slot. With only nine games remaining, however, the 73-80 Orioles are likely being realistic about their chances and not taking any unnecessary risks with Britton.

Britton, 29, put up a 2.89 ERA with 15 saves and a 29/18 K/BB ratio in 37 1/3 innings this season. He will be eligible for arbitration for the fourth and final time this offseason.