NWSB Insider and Seattle Mariners’ blogger Jeff Budke talks about a young Arm in the Seattle M’s rotation battle this season. Brandon Maurer. His AA numbers in Jackson last season point to his potential, finishing with the most consistent stats on the team. AA: 137 IP, 1.315 WHIP, 7.6 K/9 and a 3.20 ERA. This year Maurer is rarely, if ever, mentioned alongside the “big 3” pitchers the Mariners have in AAA right now (Danny Hultzen, Taijuan Walker, and James Paxton). He’s more than ready.