For single seasons, From 1901 to 2007, (requiring ERAp≥180, SOp9≥9, At least 80% games in relief, and At least 100 Innings Pitched), sorted by most recent date

  Cnt Player            Year ERA   SO/9   IP  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 Keith Foulke      1999  221 10.51 105.1  26 CHW AL  67  0  0   0 31  3  3  .500  9  72  28  26  21 123   2.22 11  411  384 18  0   4   3   3   0   4   1  2  0  0  1  .188  .235  .320  .555   40           
    2 Mariano Rivera    1996  239 10.87 107.2  26 NYY AL  61  0  0   0 14  8  3  .727  5  73  25  25  34 130   2.09  1  425  386 12  0   3   2   2   1   6   3  1  1  0  1  .189  .258  .228  .486   24           
    3 Duane Ward        1992  210  9.15 101.1  28 TOR AL  79  0  0   0 35  7  4  .636 12  76  27  22  39 103   1.95  5  414  367 10  2   3   1   3   4   5  14  4  0  0  7  .207  .282  .286  .568   56           
    4 Mark Eichhorn     1986  248  9.52 157    25 TOR AL  69  0  0   0 38 14  6  .700 10 105  32  30  45 166   1.72  8  612  548 23  3  14   7   9   2  12  15  5  0  1  2  .192  .261  .288  .549   47           
    5 Bruce Sutter      1979  187  9.77 101.1  26 CHC NL  62  0  0   0 56  6  6  .500 37  67  29  25  32 110   2.22  3  403  361  8  2   5   0   6   4   5   8  2  0  0  9  .186  .249  .244  .493   34           
    6 Rich Gossage      1977  243 10.22 133    25 PIT NL  72  0  0   0 55 11  9  .550 26  78  27  24  49 151   1.62  9  523  459 11  0   6   2   7   6   7   9  3  0  0  2  .170  .250  .253  .503   38           
    7 Bruce Sutter      1977  327 10.82 107.1  24 CHC NL  62  0  0   0 48  7  3  .700 31  69  21  16  23 129   1.34  5  411  377 14  2   7   1   9   1   5   7  4  0  0  7  .183  .231  .271  .502   31           
    8 Dick Radatz       1963  191 11.02 132.1  26 BOS AL  66  0  0   0 58 15  6  .714 25  94  31  29  51 162   1.97  9  541  468  8  2  13   5  14   3   5   5  2  0  0  5  .201  .285  .284  .569   62           
    9 Dick Radatz       1962  184 10.40 124.2  25 BOS AL  62  0  0   0 53  9  6  .600 24  95  32  31  40 144   2.24  9  506  450 18  6   2   4   5   5   5   5  2  0  0  4  .211  .279  .338  .617   68           

Seasons/Careers found: 9.

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