Rivera has had an entry in every edition of this book. Superlatives we have employed: "something special" (1996); "amazing...the most important player in baseball" (1997); "completely unhittable" (2000); "the best closer of his generation" (2002); "otherwordly" (2004); "a one-trick pony [but] the best of all time (2005); "splendid...like Fort Apache: The Lead" (2006); "the-by-acclamation Greatest Closer of All Time" (2008); "the closest thing baseball has to Fred Astaire" (2009). Get the picture?
But maybe the most important thing Baseball Prospectus has said about Rivera comes from the 2009 version. It's not quoted above because it is more a piece of advice than a superlative: "We don't know how many more years of this Rivera has in him, so enjoy it while you can still see him without having to schlep up to Cooperstown."