- Rudi Lubbers competed in the 1964 Olympics as light heavyweight, and in the 1968 Olympics as a heavyweight.
- Lubbers is best remembered for lasting the distance in a 12-round fight with Muhammad Ali in 1973.
- In 1986 Lubbers was arrested by the Portuguese police for drug smuggling (cannabis) and sentenced to 8 years in prison.
1964 (as a Light heavyweight)
- 1st round bye
- Lost to Cosimo Pinto (Italy) 0-5
1968 (as a Heavyweight)