For single seasons, From 1901 to 2008, (requiring SV≥50 and ERAp≥200), sorted by most recent date

  Cnt Player            Year SV ERA  Age Tm  Lg  G   GS CG SHO GF  W  L  W-L%   IP   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 Mariano Rivera    2004 53  231  34 NYY AL  74   0  0   0 69  4  2  .667  78.2  65  17  17  20  66   1.94  3  316  289  7  0   3   5   2   0  11   5  1  0  0  0  .225  .287  .280  .567   50 1141  781 
    2 Eric Gagne        2003 55  335  27 LAD NL  77   0  0   0 67  2  3  .400  82.1  37  12  11  20 137   1.20  2  306  279  6  0   2   3   4   0   0   2  1  0  0  2  .133  .199  .176  .375    4 1187  824 
    3 Trevor Hoffman    1998 53  263  30 SDP NL  66   0  0   0 61  4  2  .667  73    41  12  12  21  86   1.48  2  274  249  6  2   2   1   3   0   7   7  0  0  0  8  .165  .232  .229  .461   30           
    4 Bobby Thigpen     1990 57  210  26 CHW AL  77   0  0   0 73  4  6  .400  88.2  60  20  18  32  70   1.83  5  347  307  8  2   3   1   4   3  12   3  0  0  0  2  .195  .271  .283  .554   56           

Seasons/Careers found: 4.

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