Broncos Beat Raiders
Jan 1 AFC Championship, Mile High Stadium, Denver: Denver Broncos beat Oakland Raiders, 20-17
- Jan 1 NFC Championship, Texas Stadium, Irving: Dallas Cowboys beat Minnesota Vikings, 23-6
- Jan 2 44th Orange Bowl: #6 Arkansas beats #2 Oklahoma, 31-6
- Jan 2 44th Sugar Bowl: #3 Alabama beats #9 Ohio State, 35-6
- Jan 2 64th Rose Bowl: #13 Washington beats #4 Michigan, 27-20
- Jan 3 Indian cricket spin bowler B. S. Chandrasekhar becomes first in Test history to register identical figures in both innings (6 for 52) in Indian innings win over Australia in 3rd Test in Melbourne
Connor's ATP Title
Jan 8 American Jimmy Connors beats Björn Borg of Sweden 6-4, 1-6, 6-4 to win his first and only season-ending ATP Masters Grand Prix tennis title at Madison Square Garden, NYC
Durán vs. De Jesus
Jan 21 Panamanian boxer Roberto Durán becomes undisputed world lightweight champion with a 12th-round TKO of Esteban De Jesus at Caesars Palace, Las Vegas; defends his WBA title for 12th time, also takes De Jesus’ WBC title
Perry to the Padres
Jan 25 MLB San Diego Padres trade pitcher Dave Tomlin and $125,000 to Texas Rangers for Gaylord Perry (He wins 1978 Cy Young Award)
- Jan 28 Ranger's Don Murdoch failed on 4th penalty shot against Islanders
Carner Wins Colgate Triple Crown
Jan 29 Joanne Carner wins Colgate Triple Crown Match-Play Golf Championship
- Jan 30 Addie Joss & Larry MacPhail elected to Baseball Hall of Fame