Conversation so far:
Was there anything special about Johnny outside Johnny Carson's birth/death statistics and name?
Carson, an amateur astronomer, was a close friend of astronomer Carl Sagan, who often appeared on The Tonight Show.
Did Carson do anything other than the tonight show?
Carson was an avid tennis player.

Question: How did he do as a tennis player?
Self-contained rewrite: How did Johnny Carson do as a tennis player?