In his biography of Harry Nilsson, Alyn Shipton describes Harry Nilsson playing baseball in high school against a team with Carl Yastrzemski as its star player. According to the account, based on Harry's unpublished draft biography, Harry played for Bayport High and Yastrzemski for Bridgehampton. The game took place in 1957.
Unfortunately, a review of newspaper reports from the time does not produce any record of Bayport playing Bridgehampton in baseball in 1957. Bridgehampton and Bayport were different leagues, Bridgehampton in B-3 and Bayport in B-1. Bellport, not Bayport won the B-1 championship and played Bridgehampton on June 6, 1957.