1981 Oakland Athletics season

The Oakland Athletics' 1981 season saw the A's finish with an overall record of 64 wins and 45 losses. They finished the season with the best record in the American League (and second best in all of baseball). Due to the infamous 1981 players strike, the league resorted to a split-season format; this new format saw the winners of both halves of the season playing in the first divisional playoff in MLB history. The A's qualified by posting the American League West's best record in the first half of the season. While they swept the Kansas City Royals in the ALDS, they were themselves swept by the New York Yankees in the ALCS.

The Athletics' 1981 season ranks among the organization's most interesting. The A's, only two years removed from a disastrous 54–108 finish, won their first AL West crown since 1975 under second-year manager Billy Martin. The "Billyball" A's began the season with a then-AL record 11 consecutive wins (this record was later broken by the 1987 Milwaukee Brewers, who raced out to a 13-0 start). The squad followed its first loss of the season, a tough 3-2 loss to the Seattle Mariners, with six more victories. Their 17-1 start (through 18 games) remains unmatched. The A's starting rotation (consisting of Rick Langford, Matt Keough, Steve McCatty, Mike Norris, and Brian Kingman) received national attention during the torrid start; the unit was collectively featured on the cover of Sports Illustrated's April 27, 1981, edition. The periodic heroics of Tony Armas and Rickey Henderson also drew notice.

The Athletics, however, slumped badly following the 17-1 start. While they regained some of their swagger during the season's second half, they ultimately played .500 baseball for the rest of the season. Even still, the A's won the AL West's first half with a 37-23 mark; they also led the division in total wins despite losing the second half to the Royals. The A's swept these 50-53 Royals in the ALDS. The A's themselves were humbled in the ALCS, as the Yankees outscored Oakland 20-4 in a humiliating three-game rout. The 1981 ALCS is perhaps best remembered as the purported birthplace of "the wave"; while the phenomenon's origin is disputed, it is most commonly attributed to Krazy George Henderson, who introduced it to the Athletics' crowd during the series' final game.

Despite high expectations, the A's collapsed in 1982. A rash of injuries, among other factors, saw the team plummet to an abysmal 68-94 record. The firing of Billy Martin at seasons' end brought a swift and unceremonious end to the "Billyball" era. All told, the A's would have to wait until 1988 for their next postseason appearance. Only one member of the 1981 team (Rich Bordi) also played on the 1988 team.