1989 — AC Milan 4–0 Steaua Bucharest

Arrigo Sacchi's 1989 AC Milan produced what many historians rank as the greatest club side ever assembled, and their 4–0 Champions League Final win over Steaua Bucharest in Barcelona remains a benchmark of tactical perfection. Goals from Gullit (two) and Van Basten (two) showcased a Dutch trio—Gullit, Van Basten, and Rijkaard—who fused total football with Italian defensive discipline. This performance outperforms #10's 2003 final by a wide margin in terms of attacking dominance, as Milan scored four goals compared to the goalless 120 minutes of the 2003 match. Milan retained the trophy the following year, beating Benfica 1–0, cementing a dynasty that transformed European football.