Luke Jackson, RHP, Texas Rangers
2014 Stats: 21.1 IP, 2.95 ERA, .192 BAA, 5 BB, 20 K (4 GS)
Jackson has struck out eight batters and allowed three hits in back-to-back starts without yielding a run. If we removed the 22-year-old right-hander’s ugly start on April 10 (3.1 IP, 7 H, 7 ER, 2 BB) from his season line, then he’d have an unblemished ERA and 17-to-3 strikeout-to-walk ratio in 18 innings.
Jesse Biddle, LHP, Philadelphia Phillies
2014 Stats: 21.1 IP, 3.80 ERA, .250 BAA, 6 BB, 28 K (4 GS)
Biddle, 22, gave up eight runs through his first two starts this season back at Double-A Reading, but since then the left-hander has posted a 0.82 ERA and 17-to-3 strikeout-to-walk ratio in 11 innings.
Andrew Heaney, LHP, Miami Marlins
2014 Stats: 24.1 IP, 1.48 ERA, .202 BAA, 3 BB, 25 K (4 GS)
After allowing three runs on a career-worst 10 hits in his season debut, Heaney has dominated in three consecutive outings and made a strong case for an early-season promotion: 19 IP, 8 H, ER, 2 BB, 22 K.
Dan Winkler, RHP, Colorado Rockies
2014 Stats: 24 IP, 0.75 ERA, .090 BAA, 8 BB, 27 K (4 GS)
Winkler still isn’t considered a notable prospect despite leading the minor leagues last season with 175 strikeouts. However, given the 24-year-old’s outstanding start this year at Double-A Tulsa, that might not be the case for much longer. Last two starts: 12.2 IP, 4 H, 0 ER, 4 BB, 19 K.
Bryan Mitchell, RHP, New York Yankees
2014 Stats: 19 IP, 4.26 ERA, .237 BAA, 9 BB, 26 K (4 GS)
Mitchell turned in probably the best start of his career on April 14, firing six shutout innings with 12 strikeouts for Double-A Trenton. The 23-year-old spent part of last week chilling in the Yankees’ big league bullpen after he was recalled as a “just in case” depth option but never appeared in a game. On Tuesday he was back on the mound at Trenton and picked up where he’d left off the previous week, allowing one run in five innings with six strikeouts.
Taylor Jungmann, RHP, Milwaukee Brewers
2014 Stats: 21 IP, 4.71 ERA, .293 BAA, 4 BB, 22 K (4 GS)
Each of Jungmann’s four starts this season has been progressively worse. On Tuesday, the 24-year-old right-hander (and 2011 first-round draft pick) allowed eight runs (five earned) on eight hits in four innings for Double-A Huntsville.
Mark Sappington, RHP, Los Angeles Angels
2014 Stats: 17.1 IP, 6.75 ERA, .328 BAA, 13 BB, 19 K (4 GS)
Sappington, 23, began the season terribly at Double-A Arkansas by allowing 10 earned runs on 16 hits and five walks in his first two starts. His last two outings have been better (9 IP, 6 H, 3 ER), but walks have remained a problem with the right-hander issuing eight free passes during that span.