- Oct 2 17-year-old gelding Behavin Jerry, the oldest winning racehorse in modern times, sets record for most career starts by a thoroughbred, 307
Weaver vs. Tillis
Oct 3 After a year's inactivity, American boxer Mike Weaver outpoints countryman James 'Quick' Tillis in 15 rounds in Chicago to retain his WBA heavyweight title
- Oct 3 Milwaukee Brewers and Montreal Expos clinch their first-ever postseason appearances; Brewers beat Detroit, 2 - 1, for AL East title; Expos defeat NY Mets, 5 - 4, for NL East second playoff spot
- Oct 7 In 1st Eastern Division championship Yanks beat Brewers 5-3
Indy 500
Oct 9 United States Auto Club appeals panel restores disputed Indianapolis 500 victory to disqualified first-across-the-line Bobby Unser
F1 World Champion
Oct 17 Brazilian Nelson Piquet driving for Brabham finishes 5th in the season ending Caesars Palace Grand Prix in Las Vegas to clinch his first Formula 1 World Drivers Championship by 1 point from Carlos Reutemann
Sports History
Oct 25 George Steinbrenner scuffles with 2 fans in a hotel elevator
New York City Marathon
Oct 25 New York City Marathon: defending champion Alberto Salazar retains crown in 2:08:13; Allison Roe of New Zealand takes out women's race in 2:25:29
- Oct 28 Baseball World Series: LA Dodgers beat NY Yankees, 9-2 at Yankee Stadium to clinch series, 4 games to 2; first co-MVP's: LA's Ron Cey, Pedro Guerrero, Steve Yeager