Pitching Leaders

Wins
21  Dave Stewart - age 32

ERA (starters)
2.61  Mike Moore - age 29

Strikouts
172  Mike Moore - age 29

Saves
33  Dennis Eckersley - age 34

Innings Pitches
257.2  Dave Stewart - age 32

Shutouts
3  Mike Moore - age 29

Appearances
64  Rick Honeycutt - age 35

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Hitting Leaders

Batting Average

.336  Carney Lansford - age 32

Hits
185  Carney Lansford - age 32

Doubles
28  Carney Lansford - age 32

Triples
4  Luis Polonia - age 25

Home Runs
33  Mark McGwire - age 25

RBI’s
98  Dave Parker - age 38

Stolen Bases 
52  Rickey Henderson - age 30

Walks
83  Mark McGwire - age 25

Plate Appearances
643  Dave Henderson - age 30

1989 Oakland A's Leaders