Most Extra Base Hits Allowed in a Season

Before the 2008 season began, I had two posts listing the most doubles allowed in a season and the most triples allowed in a season (both were written before the B-R Play Index included 1956 data). It's easy to find a list of the most home runs allowed in a season. For whatever reason, I never put all three together...until today. Here are the pitchers who have allowed the most extra base hits in a single season since 1956.

Most Extra Base Hits Allowed in a Season, 1956-2007

Name	Team	Year	XBH Allowed	IP
Robin Roberts	PHI	1956	117	297.1
Rick Helling	TEX	2001	116	215.2
Jose Lima	HOU	2000	108	196.1
Darrell May	KCR	2004	105	186.0
Eric Milton	CIN	2005	102	186.1
Brad Radke	MIN	1996	101	232.0
Rick Helling	TEX	2000	100	217.0
Bert Blyleven	MIN	1986	100	271.2
Mickey Lolich	DET	1973	99	308.2
Rick Helling	TEX	1999	98	219.1
Chris Capuano	MIL	2006	97	221.1
Phil Niekro	ATL	1979	97	342.0
Mickey Lolich	DET	1974	96	308.0
Robin Roberts	PHI	1957	96	249.2
Brett Tomko	STL	2003	95	202.2
Jeff Suppan	KCR	2000	95	217.0
Mike Mussina	BAL	1996	95	243.1
Jim Perry	MIN	1971	95	270.0
Jim Merritt	CIN	1970	95	234.0
Jim Merritt	CIN	1969	95	251.0