Racing PositionsCatcher Chris Stewart released by Padres2Y'Pop' science: Your guide to learning a new MLB stat3YSam MillerBraves, Stewart agree on 1-year, $575K deal3YD-backs bring framing into focus with catching switch4YMark SimonThe mystery of the walk-off triple4YSam MillerPirates C Stewart has successful knee surgery4YDodgers fold an ace high, fall on a Clayton Kershaw day5YDoug PadillaPirates call up Stallings, son of Pitt hoops coach5YCubs' Jake Arrieta works his same magic against the Pirates5YJohn Jackson, Special to ESPN.comArrieta's latest gem gives Cubs their latest win5YKen Woolums, ESPN Stats & Information