Ongoing labor dispute causes MLB to cancel some spring games
Umpire (baseball) - Wikipedia
MLB lockout: A brief history of strikes and lockouts as baseball comes to a halt for first time in 26 years
MLB labor talks yield little progress; more games could be canceled
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MLB lockout: Owners could delay Opening Day if no labor deal by Monday
MLB Lockout Cuts Into the First Two Series of the Season - The New York Times