A native of
Pesaro, Serafini started racing motorcycles in 1928 on a
Benelli 175cc. He won the 1939
500cc European Championship on a
Gilera with victories in the
German,
Swedish and
Ulster Grands Prix. Serafini switched to racing single-seater cars in 1947, finishing second in the 1950
Mille Miglia and appearing in several non-Championship Formula One races. He retired from racing full-time after sustaining serious injuries during the 1951 Mille Miglia, which required multiple operations over several years, but came back for the 1954 Brescia-Rome-Brescia race, finishing seventh overall and first in the GT class. ==Racing record==