https://www.mlbtraderumors.com/2020/03/camp-battles-bostons-rotation.html
Ryan Weber, RHP: The 29-year-old Weber has pitched in the majors for the Braves, Mariners, Rays and Red Sox since 2015, but he hasn’t experienced much success in the bigs. Weber’s fastball averaged under 89 mph last year as a member of the Red Sox, with whom he struggled to a 5.09 ERA (with a much better 4.20 FIP) and 6.42 K/9, 1.77 BB/9 and a 48.6 percent groundball rate across a career-high 40 2/3 innings. While Weber worked mostly as a reliever in 2019, the Red Sox are optimistic about his chances of turning into a capable starter or at least a bulk pitcher, thanks to increased reliance on a cutter.
Chris Mazza, RHP: Mazza debuted in MLB last season with the Mets at the age of 29, but he yielded 10 earned runs on 21 hits during that 16 1/3-inning span. To Mazza’s credit, he was far better last year in Triple-A, where he put up a 3.67 ERA/3.85 FIP with 7.34 K/9, 2.13 BB/9 and a lofty 58 percent groundball rate across 76 frames.The Mets cut Mazza loose after the season, and he ended up with the Red Sox via waivers.
Mike Shawaryn, RHP: Shawaryn, 25, was a fifth-rounder of the Red Sox in 2016 who climbed to the majors for the first time last season. It didn’t go well; even though Shawaryn racked up 29 strikeouts in 20 1/3 innings, he surrendered 22 earned runs on 26 hits and issued 13 walks. And he wasn’t great with Triple-A Pawtucket, either, evidenced by a 4.52 ERA/5.65 FIP with 7.63 K/9 and 4.92 BB/9 in 89 2/3 frames.
Kyle Hart, LHP: A 19th-round pick of the Red Sox in 2016, Hart has consistently prevented runs at a solid clip in the minors, where he has never posted an ERA above the threes at any level. The 27-year-old made his Triple-A debut in 2019 and logged a 3.86 ERA/4.32 FIP with 7.18 K/9 and 3.23 BB/9 over 100 1/3 innings.
Matt Hall, LHP: Hall, 26, joined the Red Sox in a minor trade with the Tigers in January. The spin rate darling has enjoyed some success in the minors, shown in part by a 4.25 ERA with 10.3 K/9 and 3.2 BB/9 in 144 Triple-A innings, but has allowed almost 10 runs per nine with 5.17 BB/9 in a smaller sample of major league frames (31 1/3).
Phillips Valdez, RHP: Valdez was a waiver pickup from the Mariners just last week. He got his first taste of MLB action with the Rangers a season ago, and while he pitched to a 3.94 ERA, averaged better than 10 strikeouts per nine and induced grounders at a 53.3 percent clip, he walked more than five per nine at the same time. And Valdez wasn’t as good at Triple-A, where he recorded a 4.92 ERA/5.59 FIP with 7.44 K/9 and 4.12 BB/9 in 78 2/3 innings of work.
Brian Johnson, LHP: Unlike the names listed above, Johnson’s not on Boston’s 40-man roster, meaning he’s facing an especially steep climb to begin the season in the majors. Now 29, Johnson turned in passable numbers as a member of the Red Sox in 2017-18, but health problems helped hold the soft-tossing southpaw to a 6.02 ERA/5.32 FIP in 40 1/3 innings last year, when he walked over five hitters per nine.