Racing PositionsNats' Kieboom to get surgery, out for season1MNats put 10 on IL before opener, win on walk-off1YNats send projected 3B starter Kieboom to minors1YIgnoring 'Twitter World': Kieboom still at 3B1YNationals option Kieboom, activate Doolittle2YMLB players with something to prove in spring training2YCraig EdwardsNats' Kieboom leans on Notes app to prep for 3B2YNats activate Rendon, ship Kieboom to minors3YNats' Kieboom hits game-tying homer in debut3YEddie Matz