A comeback (or come-from-behind) is an occurrence of an athlete or sports team engaged in a competition overcoming a substantial disadvantage in points or position, particularly if this results in the disadvantaged team winning. It has been described as "the single greatest aspect of competition that most embodies the spirit of what makes sport extraordinary". It has been observed in spectator sports that "dramatic play seems to involve both players; cheering would often escalate when one player gained momentum, and then his/her opponent suddenly turned the tables and made a comeback", with such a result drawing more enthusiasm than one competitor defeating the other without giving up any points. Fans are likely to feel better about a team that loses after staging a "comeback that fell just short" than a team that lost by the same score after having played evenly throughout the match and then allowed the other team the winning score at the end.
In some sports, the time that it takes to score points makes a comeback impossible when there is too great a point disadvantage to overcome in the time remaining. It has been noted, however, that in "some sports, such as tennis or baseball, a comeback is possible until the very last point, regardless of what the deficit might be". Many sporting news outlets have compiled lists of "greatest comebacks" for various sports.
Some academic study of sports comebacks has been conducted. One study indicated that in the sports of basketball, football and ice hockey, the team leading in points at the beginning of the final period of play wins the game 80% of the time, with the trailing team overcoming this disadvantage 20% of the time. Another determined that the home team advantage has a significant impact on the probability of a team engineering a late comeback, noting that for professional basketball teams, "the home team is more than three times as likely to make a fourth-quarter comeback than is the visiting team (33.3% versus 10.5%)". A comeback by one competitor may coincide with, or be alternatively characterized as, a "choke" by the opponent allowing the comeback.
There is no official definition or statistic for comebacks in American football, but many fans note the ability of certain teams to mount a comeback late in the game. A team may have a second-half comeback after having fallen well behind in the first half, or a fourth-quarter comeback after having fallen well behind with only one quarter of play remaining.
Certain comebacks are particularly historically significant. For example, in American football, "The Comeback" refers to a specific NFL playoff game between the Buffalo Bills and the Houston Oilers played January 3, 1993. It featured the Bills recovering from a 32-point deficit shortly after halftime to win in overtime, 41–38. This has been referred to as "the greatest comeback in NFL history".