Short answers, pulled from the story.
A comeback is when an athlete or a team overcomes a serious disadvantage in points, position or a series score. It has been described as the single greatest aspect of competition that most embodies the spirit of what makes sport extraordinary.
The Comeback, on the 3rd of January, 1993, saw the Buffalo Bills overcome a 32-point deficit to beat the Houston Oilers 41-38 in overtime. The record for the largest NFL comeback stood until the 2022-23 Minnesota Vikings erased a 33-point deficit to beat the Indianapolis Colts 39-3.
The largest comeback in NBA history came on the 27th of November, 1996, when the Utah Jazz overcame a 36-point deficit to beat the Denver Nuggets 107-103. Karl Malone scored 31 points and Jeff Hornacek scored 29 in the win.
The 2004 Boston Red Sox became the only team in Major League Baseball history to win a best-of-seven series after trailing three games to none, doing so against the rival New York Yankees. Boston then swept the 2004 World Series against the St. Louis Cardinals, ending an 86-year championship drought known as the Curse of the Bambino.
The biggest comeback in World Cup history is considered to be Portugal's 5-3 win over North Korea in the 1966 quarterfinal, after North Korea had led 3-0 in the first half. Eusébio led Portugal's comeback by scoring four goals.
Four teams in NHL history have won a series after trailing three games to none: the 1942 Toronto Maple Leafs, the 1975 New York Islanders, the 2010 Philadelphia Flyers, and the 2014 Los Angeles Kings. The 1942 Maple Leafs remain the only team to win a Stanley Cup Final after trailing 3-0.