by Michael Hurcomb | CBSSports.com (8/15/2012) Mariners shortstop prospect Bradley Miller has handled the transition to Double-A Jackson since his mid-July promotion. Miller is batting .296 with . 394 OBP, .826 OPS, three homers and seven RBI in 21 games since his promotion. He hit .339 with a .412 OBP, .524 slugging percentage, .936 OPS, 11 homers, 33 doubles and 56 RBI in 97 games for Class A High Desert.