Tennis
Public had a chance
In 1896 was tennis already at the program, but there were only 3 participants. The officials got someone out the public to join the matches, and he won the silver medal (1st place)! His name was John Pius Boland (GB) and he had an appointment with an archaeologist in Athens and he just looked to the Olympics.
Titanic-disaster
Norris Williams (USA), was a very remarkable winner. He survived the disaster with the Titanic in 1912 (he was more than a hour in the icecold water), in World War I he was distinguish with the Croix de Guerre, and in 1920 he won the Wimbledon-title.
Away
From 1896 to 1924 was tennis on the Olympic program (except in 1916 because World War I), and then tennis was gone. In 1968 was tennis a demonstration-sport. But in 1988 came tennis again on the program. Steffi Graf (Germany) won then, and got the Golden Slam: the four Grand-Slamtourneys and Olympic gold.