Senneker's debut came in 1968, when he competed at Daytona in the prestigious Daytona 500. Starting 34th in the field of fifty, Senneker ran a fantastic race and piloted his way to a 13th place finish.
Senneker did not return to the circuit until 1970, when he competed at his home track of Michigan. It was another respectable race for the driver, completing most of the laps in route to a 21st place finish.
Senneker again went on another long hiatus, competing at Charlotte. Starting 23rd in the field of forty-one, Senneker could not take advantage of his J.D. Stacy-powered racecar after crashing to 21st.
Senneker's final five races, though, would all come during the 1983 season, when he finished 44th in points. The year started off rough for the driver, failing to finish in the first two races and finishing no better than 27th. After that, Senneker showed some muscle. He finished no worse than 16th in his final three starts, recording a 14th and 16th at Michigan to go along with a 15th in his final career race at Atlanta.