Racing PositionsNats catcher Avila, 34, will retire at end of season5YNats put 10 on IL before opener, win on walk-off5YNats add backup catcher Avila on 1-year deal6YTwins finalize deals for Pineda, Avila7YSources: Twins, catcher Avila reach $4.25M deal7YAvila leaves Tigers for 1-year deal with White Sox2YDoug Padilla2013 preseason injury watch: Catcher2YStephania Bell