Conversation so far:
Where was Sean born?
CANNOTANSWER.
Where did Sean grow up?
CANNOTANSWER.
When did Sean begin cycling?
7 February 1977.
How did he become a prominent cyclist?
shortly afterwards he won his first race, the opening stage of the Tour of Romandy.

Question: what was his first race?
Self-contained rewrite: what was cyclist Sean Kelly's first race?