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If he only walked one guy, that means every single pitch was in the strikezone so it's not surprising he was giving up hits. Even Felix is hittable if he challenges too much, as Dr. D has pointed out. However, even with all the hits he only gave up ONE home run (in stark contrast to the results Felix got with that approach) and struck out over 20% of the batters faced. That suggest he's got some quality stuff. It certainly seems to me he should be in the top 30 M's prospects.