BRADENTON, Fla. — Isaac Mattson has heard his disappearing four-seam fastball described as a unicorn fastball, invisible fastball or even the invisi-ball, but the Pittsburgh Pirates right-handed ...
Pittsburgh optioned Mattson to Triple-A Indianapolis on Wednesday. The 30-year-old will be sent back to Triple-A after posting a 4.12 ERA and 15 strikeouts in 19.2 innings for Pittsburgh on the season ...
Mattson allowed two hits while striking out two in one inning Monday in a 5-0 loss to the Padres. Mattson was a revelation out of the bullpen for the Pirates last season, posting a 2.45 ERA in 44 ...
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