Racing PositionsCatcher Chris Stewart released by Padres7Y'Pop' science: Your guide to learning a new MLB stat8YSam MillerBraves, Stewart agree on 1-year, $575K deal8YD-backs bring framing into focus with catching switch9YMark SimonThe mystery of the walk-off triple9YSam MillerPirates C Stewart has successful knee surgery10YDodgers fold an ace high, fall on a Clayton Kershaw day10YDoug PadillaPirates call up Stallings, son of Pitt hoops coach10YCubs' Jake Arrieta works his same magic against the Pirates10YJohn Jackson, Special to ESPN.comArrieta's latest gem gives Cubs their latest win10YKen Woolums, ESPN Stats & Information