Top 7 Biggest Sports Could-have-beens In History

His missing prime matters beyond box scores: he could have accelerated the NBA's international guard revolution.

Petrović was helping prove that European guards could be NBA stars before his death at 28, making him a global basketball what-if as well as a personal tragedy.

This earns a spot because the lost opportunity may have affected not just a season, but the viability and identity of a franchise.

The Expos had MLB's best record when the 1994 strike ended the season, costing a low-payroll, talent-rich team its best shot at a World Series and possibly changing baseball history in Montreal.

Ranks near the top because the combination of verified elite performance, unprecedented athletic profile, and abrupt injury creates an unusually persuasive what-if.

Jackson may be the cleanest modern example of a ceiling no one got to measure: an MLB All-Star and NFL Pro Bowler whose elite two-sport career was permanently altered by a devastating hip injury at age 28.

His case carries maximum historical stakes because it affected both a legendary franchise's future and the public conversation around drugs and sports.

Bias was drafted No. 2 overall by the defending champion Boston Celtics in 1986 and died two days later, creating one of basketball's most haunting alternate histories: a superstar prospect who never played an NBA minute.

He ranks this high because the lost seasons were not speculative development years; they were missing prime years from arguably the greatest pitching peak ever.

Koufax retired at 30 while at the peak of his powers after arthritis in his pitching arm, leaving baseball with an all-time great who plausibly had several more Cy Young-caliber seasons ahead.

He belongs because his confirmed peak was so dazzling that the missing longevity still feels historically expensive.

Sayers' open-field brilliance produced a Hall of Fame career despite knee injuries that effectively compressed his greatness into only a few full seasons.