For single seasons, From 1901 to 2007, (requiring ERA≥0.01 and ERA≤.5), sorted by greatest IP

  Cnt Player              **IP**    ERA  Year Age Tm  Lg  G  GS CG SHO GF  W  L  W-L% SV  H   R   ER  BB  SO ERA  HR  BF   AB  2B 3B IBB HBP  SH  SF GDP  SB CS Pk BK WP   BA   OBP   SLG   OPS  OPS   Pit  Str
 ----+-----------------+---------+------+----+---+---+--+---+--+--+---+--+--+--+-----+--+---+---+---+---+---+----+--+----+----+--+--+---+---+---+---+---+---+--+--+--+--+-----+-----+-----+-----+----+----+---- 
    1 Buck O'Brien         47.2     0.38 1911  29 BOS AL   6  5  5   2  1  5  1  .833  0  30   9   2  21  31  866  0  189                  1                        0  0                            0           
    2 Joba Chamberlain     24       0.38 2007  21 NYY AL  19  0  0   0  3  2  0 1.000  1  12   2   1   6  34 1192  1   91   83  4  0   0   1   1   0   1   1  0  0  0  1  .145  .211  .229  .440   16  343  219 
    3 Cliff Markle         23       0.39 1915  21 NYY AL   3  2  2   0  1  2  0 1.000  0  15   3   1   6  12  749  1   87                  0                        0  1                            0           
    4 Joel Johnston        22.1     0.40 1991  24 KCR AL  13  0  0   0  1  1  0 1.000  0   9   1   1   9  21 1028  0   85   75  1  0   3   0   1   0   1   1  1  0  0  0  .120  .214  .133  .347   -2           
    5 Tony Faeth           18.1     0.49 1919  25 CLE AL   6  0  0   0  4  0  0        0  13   4   1  10   7  682  0   68                  0                        0  0                            0           
    6 Eric Bell            18       0.50 1991  27 CLE AL  10  0  0   0  3  4  0 1.000  0   5   2   1   5   7  837  0   61   55  0  0   0   1   0   0   3   2  0  0  0  0  .091  .180  .091  .271  -22           

Seasons/Careers found: 6.

 Photos from the George Grantham Bain Collection at the Library of Congress.