Events in Sport May 15 First baseball enclosure opens at Union Grounds, Brooklyn Birthdays in Sport May 23 William "Dummy" Hoy, professional baseball player who lived to 99 May 28 Henry Slocum, American tennis player (US Nationals 1888-89), born in Syracuse, New York (d. 1949) Share On Facebook Share On Twitter 1861 On This Day in Sport 1863