The "30-30 Club" is a slang term used by baseball fans and sportswriters to describe the group of baseball players who have ever recorded at least 30 home runs and 30 stolen bases in the same season. There is no actual club to which these players belong. Instead the term "club" connotes the exclusivity and difficulty of entering into this group, as the skills required to hit many home runs and steal many bases are rarely found together in the same ballplayer.

The frequency of 30-30 seasons has gradually been increasing over time, such that the 30-30 club is no longer as exclusive as it used to be. Ken Williams became the founding member of the club in 1922, when he hit 39 homers and stole 37 bases, and was the sole member of the club for 34 years until Willie Mays recorded back to back 30-30 seasons in 1956 and 1957. Occurrences increased thereafter - there were two more 30-30 seasons in the 1960s, five in the 1970s, seven in the 1980s, 20 in the 1990s.

However, with the stolen base increasingly falling out of favor as an offensive weapon, it seems likely that the 1990s will be the high water mark of for 30-30 club seasons. Although there have already been 11 30-30 seasons recorded so far in the 2000s, representing the second highest total after the 1990s, the pace is slowing noticeably, and is likely to continue to decline in the future.

The father and son duo of Bobby Bonds and Barry Bonds share the record for the most 30-30 seasons with five apiece. Alfonso Soriano still has a shot to tie or break that record as he already has recorded four 30-30 seasons. Otherwise, Howard Johnson had three 30-30 seasons, but no other player has had more than two.

At present there are 28 members of the 30-30 club. Four of them are members of the even more elite 40-40 club - founding member Jose Canseco, Barry Bonds, Alex Rodriguez, and Alfonso Soriano. No one has ever reached 50-50 in a season so far.

As of this writing, the members of the 30-30 club are (in order of induction, with years in which they achieved 30-30, 40-40 years in bold):

  1. Ken Williams - 1922
  2. Willie Mays - 1956, 1957
  3. Hank Aaron - 1963
  4. Bobby Bonds - 1969, 1973, 1975, 1977, 1978
  5. Tommy Harper - 1970
  6. Dale Murphy - 1983
  7. Joe Carter - 1987
  8. Eric Davis - 1987
  9. Howard Johnson - 1987, 1989, 1991
  10. Darryl Strawberry - 1987
  11. Jose Canseco - 1988
  12. Barry Bonds – 1990, 1992, 1995, 1996, 1997
  13. Ron Gant - 1991, 1992
  14. Sammy Sosa - 1993, 1995
  15. Dante Bichette - 1996
  16. Ellis Burks - 1996
  17. Barry Larkin - 1996
  18. Jeff Bagwell - 1997, 1999
  19. Raul Mondesi - 1997, 1999
  20. Larry Walker - 1997
  21. Shawn Green - 1998
  22. Alex Rodriguez - 1998
  23. Preston Wilson - 2000
  24. Bobby Abreu - 2001, 2004
  25. Jose Cruz, Jr. - 2001
  26. Vladimir Guerrero - 2001, 2002
  27. Alfonso Soriano - 2002, 2003, 2005, 2006
  28. Carlos Beltran - 2004

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