Olaf Selmar Brenegan
- Bats Left, Throws Right
- Height 6' 2", Weight 185 lb.
- Debut April 24, 1914
- Final Game April 24, 1914
- Born September 1, 1890 in Galesville, WI USA
- Died April 20, 1956 in Galesville, WI USA
Sam Brenegan was the pride of Galesville, WI, where he was born and died. In 1939, the Galesville baseball club declared a Sam Brenegan night in honor of what was at the time thought to be the 100th anniversary of baseball.
Brenegan had played for the local team, and his brother John encouraged him to come to Virginia, where John lived, to play in the Virginia League. Sam and Harry Heathcote became famous when Heathcote pitched no-hitters in both ends of a doubleheader, and Ripley put it in "Believe It or Not".
Although Brenegan only appeared in one game in April 1914, he was apparently on the Pittsburgh Pirates team at the end of 1913 and the start of 1914. According to Sam's obituary, he had told a writer that he had been out drinking the night before, and in his only major league appearance had muffed a foul fly ball, which angered manager Fred Clarke. When Sam also got angry, it was the end of his brief major league career.