What happened: A fantasy baseball breakdown grades more than 40 starting pitchers as buy or sell candidates heading into the All-Star break. The analysis leans on recent-form metrics — SIERA, K-BB%, Stuff+ and Location+ — for arms with at least 20 innings since May 15 to separate lucky runs from real skill. Emmet Sheehan, Jack Flaherty, Braxton Ashcraft and Cade Cavalli headline names whose underlying numbers outpace their surface stats.
Why it matters: With the season past its midpoint, managers know where their rosters stand and pitching is often the swing category in tight races. Identifying arms whose ERA lags their skill — or vice versa — is how contenders upgrade before the stretch run without overpaying. The framework flags several high-strikeout, well-located starters as undervalued despite bloated ERAs.
By the numbers: Since May 15 (league averages: SIERA 4.12, K-BB% 14%, Stuff+ 99, Location+ 102): Braxton Ashcraft leads with a 2.94 SIERA and 24.4% K-BB% over 54 IP despite a 3.83 ERA. Cade Cavalli posts a 3.01 SIERA (3.42 ERA, 50 IP), Jack Flaherty a 3.17 SIERA (4.09 ERA), and Tatsuya Imai a 3.16 SIERA. On the flip side, Aaron Nola (6.91 ERA, 4.08 SIERA) and Shota Imanaga (6.18 ERA, 4.19 SIERA, 112.6 Location+) carry ERAs well above their skill markers. Sandy Alcantara owns a better SIERA (4.28) than ERA (5.00) across a group-high 68.1 IP.
What to watch: Watch how these arms perform in their final starts before the break, as a strong outing can shift trade leverage in either direction. Managers weighing deals should track workload and role for names like Ashcraft, Sheehan and Cavalli.