Adu Celso
Adu Celso-Santos was a Brazilian professional motorcycle road racer. He was the first Brazilian to compete in Grand Prix motorcycle racing.
Celso-Santos was popular on the Grand Prix circuit during first half of the 1970s. He raced from 1972 to the 1975 season before returning to Brazil.
In the 1973 Grand Prix season, he gained his only victory in a race counting for world championship points when he won the 350cc class at the Spanish Grand Prix held at the Jarama Circuit.Points system from 1969 onwards:
| Position | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Points | 15 | 12 | 10 | 8 | 6 | 5 | 4 | 3 | 2 | 1 |
| Year | Class | Team | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | Points | Rank | Wins |
| 1972 | 350cc | Yamaha | GER
- | FRA
7 | AUT
- | NAT
- | IOM
- | YUG
- | NED
4 | DDR
- | CZE
- | SWE
- | FIN
- | ESP
4 | 12 | 14th | 0 |
| 1973 | 250cc | Yamaha | FRA
- | AUT
- | GER
4 | | IOM
- | YUG
6 | NED
6 | BEL
- | CZE
- | SWE
3 | FIN
- | ESP
- | 20 | 12th | 0 |
| 1973 | 350cc | Yamaha | FRA
10 | AUT
- | GER
- | NAT
- | IOM
- | YUG
5 | NED
7 | | CZE
10 | SWE
5 | FIN
- | ESP
1 | 33 | 7th | 1 |
| 1974 | 350cc | Yamaha | FRA
- | GER
- | AUT
- | NAT
9 | IOM
- | NED
- | SWE
- | FIN
- | YUG
- | ESP
- | | | 2 | 45th | 0 |
| 1975 | 350cc | Yamaha | FRA
- | ESP
9 | AUT
3 | GER
- | NAT
- | IOM
- | NED
- | BEL
- | SWE
- | FIN
- | CZE
- | YUG
- | 12 | 18th | 0 |
| 1975 | 500cc | Yamaha | FRA
- | ESP
- | AUT
- | GER
9 | NAT
- | IOM
- | NED
- | BEL
- | SWE
- | FIN
- | CZE
- | YUG
- | 2 | 41st | 0 |
