In a game against St. Louis on June 14, 1876, Leonard and his teammates experienced the worst day in the field that any major league team ever has. Boston committed 24 errors in their 20-6 loss to St. Louis. Leonard, playing second base, committed nine of them. Both of those figures remain major league records. St. Louis committed 16 errors, for a two-team record total 40. ("The Sporting News Baseball Record Book", 2007, p.83) [http://www.retrosheet.org/boxesetc/1876/06141876.htm] (Boston "Post", June 15, 1876, p.3, "A Miserable Fielding Display.")