Here's the top 60 as of April 30, 2006: Which also includes when they were in Philadelphia (1901-1954) and Kansas City (1955-1967). OAKLAND A'S CAREER AT BATS >= 1000 SLG SLG AB 1 Jimmie Foxx .640 4397 2 Al Simmons .584 5132 3 Mark McGwire .551 4448 4 Jason Giambi .545 3398 5 Bob Johnson .520 5428 6 Bob Cerv .509 1401 7 Matt Stairs .509 2019 8 Jose Canseco .507 3970 9 Eric Chavez .500 3810 10 Geronimo Berroa .499 1733 11 Reggie Jackson .496 4686 12 Mickey Cochrane .490 4097 13 Gus Zernial .489 3115 14 Joe Hauser .478 1996 15 Mike Higgins .477 2208 16 Ben Grieve .475 1756 17 Home Run Baker .470 3437 18 Tilly Walker .469 2685 19 Norm Siebern .463 2236 20 Bing Miller .463 4762 21 Eric Byrnes .462 1317 22 Erubiel Durazo .462 1200 23 Miguel Tejada .460 3584 24 Harry Simpson .458 1344 25 Dave Revering .452 1456 26 Dave Kingman .450 1702 27 Nap Lajoie .449 1464 28 George Burns .449 1084 29 Wally Moses .445 4289 30 Dave Henderson .445 2553 31 Jermaine Dye .444 1473 32 Sam Chapman .442 4742 33 Bill Lamar .442 1678 34 Mark Kotsay .437 1276 35 Eddie Collins .436 3883 36 Gene Tenace .435 2458 37 Ruben Sierra .435 1421 38 Vic Power .435 2260 39 Mule Haas .434 2518 40 Tony Armas .434 2484 41 Hector Lopez .433 2134 42 Mike Davis .433 2545 43 Harold Baines .431 1060 44 Sammy Hale .430 2607 45 Rickey Henderson .430 6140 46 Joe Rudi .430 3993 47 Mitchell Page .429 2092 48 Socks Seybold .427 3596 49 Frankie Hayes .426 3351 50 Terry Steinbach .426 4162 51 Rick Monday .422 2059 52 Hal Smith .421 1109 53 Sal Bando .418 5145 54 Scott Brosius .416 1988 55 Bobby Estalella .415 1344 56 Hank Majeski .412 2221 57 Terrence Long .411 2286 58 Jimmy Dykes .411 6023 59 Harry Davis .408 5367 60 Ferris Fain .408 2991