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Jones has worked on a two-seam fastball this offseason and will test the pitch in spring training games, Alex Stumpf of MLB.com reports.

Jones flashed his potential as a rookie last year with a 4.14 ERA in 22 starts, but his 1.3 HR/9 was a blemish in his skills profile. Like teammate Paul Skenes, Jones is working on a pitch with sinking action in an attempt to keep the ball in the yard more effectively. That could also hurt his potential strikeout upside, though he didn't commit to using that pitch in the regular season.

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