Ted Williams set the original Major League "standard" / record for highest on base percentage during a single season with .551 during 1941, a record broken by Barry Bonds during the 2002 season (.582) then shattered in 2004 (.609).
You can learn how to calculate on base percentage today by visiting our statistics section and with that formula, and knowing that it takes at least one-thousand (1,000) games played, easily determine how Brian Giles, Bobby Abreu and Vladimir Guerrero recently made the top 1000.
Did you know that Wade Boggs had five consecutive seasons, 1985 | 1986 | 1987 | 1988 | 1989, during his career where he led the American League in on-base percentage setting the American League record? Click here to see the National League / Major League OBP record holder and try to make a guess as to who it is before you click the link.