After gaining experience in European Formula Three, Fangio made his professional debut as a racing driver in the IMSA series in 1984, competing in the Miami Grand Prix in a Porsche 935 alongside Hugo Gralia.
Fangio's most successful years came in the IMSA GTP class, where he achieved a record that stands as one of the finest in American sports car racing. He won two GTP driver's championships and contributed to two manufacturer titles while competing for Toyota in partnership with All American Racers, run by Dan Gurney. Fangio established an IMSA record with 19 solo victories — part of a total of 21 GTP wins — and won the prestigious 12 Hours of Sebring twice, matching a feat previously achieved by his uncle. His victories were accumulated primarily behind the wheel of the Eagle HF89/90 and Eagle MkIII GTP cars built by All American Racers.
Fangio recorded ten pole positions across his IMSA career. The American Auto Racing Writers and Broadcasters Association (AARWBA) recognized his achievements by naming him an "All-American" in both 1992 and 1993, and also awarded him the AARWBA Driver of the Year title for 1992.
Fangio also competed in the CART open-wheel series but did not win any races there, something he later described as a personal regret. His team owner in CART, Dan Gurney, was also a close personal friend. In 1997, Fangio telephoned Gurney to announce his retirement from CART competition, explaining: "I have discovered that regardless of what my passion says, despite what I command my mind to do, I am no longer able to give my whole being, my total focus at the exclusion of everything else to this sport that I love. 99% is not enough, I shall stop." Gurney paid tribute, describing Fangio as "a gentleman in a driver's suit with a core of steel exuding an aura of Latin American dignity and honor even in the worst of circumstances."
After stepping back from CART, Fangio returned to Argentina in 1998 to race in the South American Super Touring Car Championship, finishing fifth in the standings with one win and five podiums in a Peugeot 406. He made a final competitive appearance at the 1999 12 Hours of Sebring, co-driving a Ferrari 333 SP for Doyle-Risi Racing and finishing sixth, before retiring from motorsport altogether. He has since remained in his hometown of Balcarce, Argentina.
Juan Manuel Fangio II carved out a distinct identity in American motorsport entirely separate from his famous surname. His IMSA record — two championships, 21 GTP wins, 19 solo victories — places him among the most accomplished sports car racers of his era. The combination of his driving talent and his close professional relationship with Dan Gurney at All American Racers produced one of the most successful driver-team partnerships in IMSA history. His reflective announcement of retirement, stressing that total commitment was non-negotiable, has become one of the more quoted exits from American racing.
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