Racing PositionsArrieta announces retirement: 'It's just my time'1MThe best and worst MLB free-agent signings of the past decade5MDavid SchoenfieldTatis: Clash with Machado will make us stronger8MPadres starter Arrieta exits in 1st with groin strain8MArrieta injured as Padres close a 'brutal' 1-5 trip9MJesse RogersPadres take chance on Arrieta with Darvish on IL9MCubs release Arrieta but laud his role in success10MJesse RogersCubs place P Arrieta on IL with tight hamstring1YJesse RogersCubs' Arrieta: 'Not even close' to being done1YJesse RogersCubs activate Arrieta, Hoerner from IL for Tigers1YJesse Rogers