The greatest upset in sports history is a matter of opinion, but some of the most commonly cited contenders include:

* **U.S. Olympic hockey team over Soviet Union in the Winter Olympics, 1980**. The United States was a group of college kids, while the Soviet Union was a team of professional players who had won the gold medal in the previous four Olympics. The Americans pulled off a stunning 4-3 victory, which is known as the "Miracle on Ice."
* **New York Jets defeat Baltimore Colts, Super Bowl III, 1969**. The Jets were a 17-point underdog against the Colts, who were considered one of the greatest teams in NFL history. The Jets won 16-7, giving the AFL its first Super Bowl victory.
* **Villanova tops Georgetown to win 1985 NCAA championship**. Villanova was a 16-seed, the lowest seed ever to reach the NCAA championship game. They upset top-seeded Georgetown 66-64, becoming the first team from outside the power conferences to win the title.
* **Buster Douglas KOs Mike Tyson for heavyweight championship, 1990**. Tyson was the undefeated heavyweight champion, and Douglas was a 42-1 underdog. Douglas knocked Tyson out in the 11th round, one of the biggest upsets in boxing history.
* **Appalachian State football over Michigan, 2007**. Appalachian State was a 31-point underdog against Michigan, who was ranked #5 in the country. Appalachian State won 34-32, one of the biggest upsets in college football history.

Ultimately, the greatest upset in sports history is the one that most surprised and captivated the public. These are just a few of the many upsets that have had a lasting impact on sports fans.
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