Double

A two base hit, abbreviated 2B, when a player safely reaches second base on a hit. A double is also awarded when a player is thrown out between second and third base trying for a triple. Also see ground rule double.

Bill James has recently published an article stating that Tris Speaker's career record for doubles is likely to be broken in the next few decades because so many more doubles are being hit, by players who tend to have longer careers. 

All Time Leaders
Span	Player	Total	Notes
Career	Tris Speaker	792
Season	Earl Webb	67	1931
Game	Several Players	4
NPB Career	Kazuyoshi Tatsunami	450+
NPB Season	Yoshitomo Tani	52	2001
Minor League Career	Spencer Harris	743
Minor League Season	Lyman Lamb	100	1924
AAGPBL Career	Betty Foss	117
AAGPBL Season	Betty Foss	34	1951
AAGPBL Game	Lois Florreich	3	July 1, 1945