Spanning Multiple Seasons or entire Careers, From 1901 to 2008, Younger than 23, (requiring At least 1000 Innings Pitched), sorted by greatest ERAp

Player ages are computed as their age on June 30th

  Cnt Player            **ERA **   IP   From  To   Ages   G   GS  CG SHO  GF  W   L   W-L%  SV   H    R   ER   BB   SO    ERA   HR   BF  IBB HBP  BK  WP Teams
 ----+-----------------+--------+------+----+----+-----+----+---+---+---+---+---+---+-----+---+----+----+----+----+----+------+---+-----+---+---+---+---+----------- 
    1 Joe Wood             151   1147.1 1908 1913 18-23  175 127 100  24  40  92  48  .657   6  903  415  254  334  856   1.99   8  4555      48   0  35 BOS         
    2 Walter Johnson       148   1355.1 1907 1911 19-23  175 157 135  26  17  82  78  .513   4 1095  433  267  303  915   1.77  11  5445      49   1  67 WSH         
    3 Christy Mathewson    138   1346.2 1901 1904 20-23  167 158 135  20   9  97  59  .622   3 1156  501  330  348  859   2.21  17  5497      37   3  67 NYG         
    4 Bob Feller           136   1448.1 1936 1941 17-22  205 175 117  16  24 107  54  .665  10 1149  569  512  815 1233   3.18  59  6191      26   7  46 CLE         
    5 Dwight Gooden        134   1172.2 1984 1988 19-23  158 158  52  19   0  91  35  .722   0  960  381  341  332 1067   2.62  56  4718  15  16  19  19 NYM         
    6 Bert Blyleven        134   1335.2 1970 1974 19-23  181 178  77  21   2  80  75  .516   0 1197  462  406  319 1094   2.74  90  5429  21  35   7  24 MIN         
    7 Frank Tanana         131   1082   1973 1977 19-23  142 137  73  19   3  66  49  .574   0  906  355  323  292  937   2.69  93  4379  17  36   4  27 CAL         
    8 Babe Ruth            129   1057   1914 1918 19-23  141 129  93  17   8  80  41  .661   3  786  317  246  367  453   2.09   7  4268      27   3  20 BOS         
    9 Don Drysdale         128   1071.1 1956 1960 19-23  188 142  47  14  29  66  54  .550   4  957  424  382  329  822   3.21 100  4462  26  52   5  24 BRO-LAD     
   10 Hal Newhouser        122   1003   1939 1944 18-23  184 130  59   9  41  63  61  .508   8  882  448  360  544  633   3.23  31  4355       6   4  18 DET         
   11 Waite Hoyt           117   1013.2 1918 1923 18-23  153 113  69   8  30  65  46  .586   5 1021  446  375  292  332   3.33  28  4285      19   1  13 NYG-BOS-NYY 
   12 Fernando Valenzue    116   1013   1980 1984 19-23  141 131  50  18   4  61  47  .565   1  858  393  339  354  824   3.01  54  4152  30   8   3  31 LAD         
   13 Larry Dierker        108   1250.1 1964 1970 17-23  181 168  60   9   5  71  62  .534   1 1119  506  443  353  874   3.19 101  5153  26  20   2  58 HOU         
   14 Chief Bender         102   1160.1 1903 1907 19-23  169 127 109  14  39  76  54  .585   6  992  473  346  296  689   2.68  18  2809      51   2  31 PHA         
   15 Pete Schneider       102   1274   1914 1919 18-23  207 162  84  10  35  59  86  .407   4 1199  541  377  498  487   2.66  16  5399      52   0  16 CIN-NYY     
   16 Earl Hamilton        102   1150.1 1911 1915 19-23  183 129  79  11  34  55  73  .430   5 1084  524  379  407  469   2.97  18  4707      44   1  24 SLB         
   17 Mike McCormick        99   1087   1956 1962 17-23  224 150  45  12  35  59  59  .500   8 1066  514  456  373  646   3.78 117  4615  38  11   2  36 NYG-SFG     
   18 Johnny Lush           98   1014   1904 1909 18-23  146 130  92  15  14  52  72  .419   1  934  454  289  343  436   2.57  11  4239      56   2  32 PHI-TOT-STL 
   19 Catfish Hunter        94   1050.1 1965 1969 19-23  171 149  41  12   4  55  64  .462   1  911  444  402  348  703   3.44 117  4330  26  15   5  16 KCA-OAK     

Seasons/Careers found: 19.

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