1980 Minnesota Twins Starters
(77-84) 
Starters
Starter Date Vs. IP BF W/L ER R H K BB HR Pit Str Ball Str%
Jerry Koosman Apr 10 OAK 6.2 25 4 4 7 4 1 0 None None None None
Pete Redfern Apr 11 OAK 8.0 28 L 1 1 4 5 0 0 None None None None
Geoff Zahn Apr 12 OAK 9.0 31 W 0 0 3 1 0 0 None None None None
Roger Erickson Apr 13 OAK 2.0 11 L 3 3 3 0 3 0 None None None None
Terry Felton Apr 14 CAL 7.0 27 3 3 6 3 1 1 None None None None
Jerry Koosman Apr 15 CAL 4.1 20 L 2 3 7 2 1 1 None None None None
Pete Redfern Apr 16 CAL 8.0 32 1 1 6 7 0 0 None None None None
Geoff Zahn Apr 17 SEA 8.1 32 L 3 4 6 3 1 1 None None None None
Roger Erickson Apr 18 SEA 8.0 29 L 2 3 6 4 1 0 None None None None
Terry Felton Apr 18 (2) SEA 5.1 22 L 3 3 5 7 1 0 None None None None
Jerry Koosman Apr 19 SEA 8.1 32 W 3 3 7 4 2 1 None None None None
Pete Redfern Apr 20 SEA 5.0 23 W 1 2 4 6 3 0 None None None None
Geoff Zahn Apr 22 @CAL 9.0 32 W 1 1 6 3 0 0 None None None None
Terry Felton Apr 23 @CAL 0.2 8 L 4 4 3 1 2 0 None None None None
Jerry Koosman Apr 25 @OAK 7.2 33 W 2 2 7 5 3 2 None None None None
Pete Redfern Apr 26 @OAK 7.0 25 W 1 1 3 6 2 0 None None None None
Geoff Zahn Apr 27 @OAK 4.1 26 8 8 14 2 2 0 None None None None
Terry Felton Apr 28 @SEA 3.2 19 L 1 5 3 2 4 0 None None None None
Jerry Koosman Apr 29 @SEA 7.0 26 2 2 5 3 1 1 None None None None
Pete Redfern Apr 30 @SEA 9.0 36 W 2 3 9 5 1 0 None None None None
Geoff Zahn May 2 @NYY 5.1 25 L 3 5 8 2 1 1 None None None None
Darrell Jackson May 3 @NYY 5.1 25 L 4 4 7 0 2 1 None None None None
Jerry Koosman May 4 @NYY 3.1 20 L 7 7 9 2 2 1 None None None None
Pete Redfern May 5 BAL 5.2 25 W 2 2 6 4 2 0 None None None None
Geoff Zahn May 6 BAL 6.0 30 L 2 8 12 3 3 1 None None None None
Albert Williams May 7 BAL 3.0 15 4 4 7 2 0 1 None None None None
Jerry Koosman May 9 NYY 7.1 29 L 4 5 7 2 0 1 None None None None
Darrell Jackson May 10 NYY 10.0 35 W 0 0 5 2 1 0 None None None None
Geoff Zahn May 11 NYY 6.2 30 L 5 5 7 3 3 0 None None None None
Pete Redfern May 12 BOS 8.0 33 W 3 3 7 3 3 1 None None None None
Albert Williams May 13 BOS 2.2 17 3 4 6 3 2 1 None None None None
Jerry Koosman May 14 BOS 5.1 23 6 6 8 7 0 1 None None None None
Darrell Jackson May 16 @MIL 1.0 8 3 3 5 1 0 1 None None None None
Geoff Zahn May 17 @MIL 0.2 8 L 5 5 5 0 1 1 None None None None
Pete Redfern May 18 @MIL 7.0 31 W 3 4 8 5 2 1 None None None None
Jerry Koosman May 19 CWS 8.0 29 L 1 1 3 3 2 0 None None None None
Darrell Jackson May 20 CWS 5.1 23 L 3 3 4 4 4 0 None None None None
Geoff Zahn May 21 CWS 9.0 37 W 2 2 7 2 4 0 None None None None
Pete Redfern May 23 MIL 3.2 18 L 5 5 5 5 2 2 None None None None
Jerry Koosman May 24 MIL 6.1 28 L 4 4 8 4 1 1 None None None None
Roger Erickson May 25 MIL 8.0 31 L 3 3 7 5 1 1 None None None None
Geoff Zahn May 26 @CWS 6.2 28 L 5 6 10 2 1 0 None None None None
Darrell Jackson May 27 @CWS 7.0 26 L 2 2 5 1 1 1 None None None None
Pete Redfern May 28 @CWS 5.2 24 4 4 7 3 0 1 None None None None
Jerry Koosman May 29 @CWS 9.0 33 W 2 2 5 5 4 0 None None None None
Roger Erickson May 30 @BAL 6.0 24 1 2 5 3 2 1 None None None None
Geoff Zahn May 31 @BAL 3.0 19 L 5 7 10 4 1 1 None None None None
Pete Redfern Jun 2 @BOS 4.1 22 L 4 5 8 2 2 1 None None None None
Jerry Koosman Jun 3 @BOS 9.0 36 W 1 4 5 3 2 1 None None None None
Geoff Zahn Jun 6 @TOR 9.0 32 W 0 0 1 6 3 0 None None None None
Darrell Jackson Jun 7 @TOR 7.1 27 W 2 2 6 2 1 2 None None None None
Roger Erickson Jun 8 @TOR 8.1 32 W 1 1 4 3 1 1 None None None None
Jerry Koosman Jun 8 (2) @TOR 8.2 35 4 4 9 5 1 1 None None None None
Geoff Zahn Jun 10 DET 2.1 14 L 5 5 5 1 1 0 None None None None
Darrell Jackson Jun 11 DET 6.0 26 W 2 3 8 0 3 1 None None None None
Pete Redfern Jun 12 DET 3.2 18 4 4 6 2 2 1 None None None None
Jerry Koosman Jun 13 CLE 3.2 21 L 5 5 7 2 4 0 None None None None
Roger Erickson Jun 14 CLE 6.1 29 L 2 3 8 2 3 0 None None None None
Darrell Jackson Jun 15 CLE 3.2 21 L 6 6 7 5 2 1 None None None None
Geoff Zahn Jun 16 TOR 9.0 37 W 0 0 9 5 3 0 None None None None
Pete Redfern Jun 17 TOR 4.2 25 5 6 11 0 2 2 None None None None
Darrell Jackson Jun 19 @DET 7.2 30 W 0 0 6 8 2 0 None None None None
Roger Erickson Jun 20 @CLE 5.2 25 3 3 7 1 3 1 None None None None
Geoff Zahn Jun 21 @CLE 8.1 31 W 2 2 10 5 0 0 None None None None
Pete Redfern Jun 22 @CLE 3.1 19 L 6 6 8 2 3 0 None None None None
Jerry Koosman Jun 23 @KCR 9.0 38 W 1 1 10 15 2 0 None None None None
Darrell Jackson Jun 24 @KCR 9.0 33 W 1 1 5 7 2 0 None None None None
Roger Erickson Jun 24 (2) @KCR 5.0 25 L 3 3 11 2 0 0 None None None None
Geoff Zahn Jun 25 @KCR 9.0 36 L 4 4 10 5 1 1 None None None None
Pete Redfern Jun 27 TEX 1.0 8 L 4 4 5 1 0 1 None None None None
Jerry Koosman Jun 28 TEX 2.0 12 L 5 5 7 0 0 1 None None None None
Roger Erickson Jun 29 TEX 6.0 27 W 2 2 7 4 2 1 None None None None
Darrell Jackson Jun 30 KCR 7.0 30 W 3 3 4 7 6 1 None None None None
Geoff Zahn Jul 1 KCR 7.1 30 1 1 8 2 1 0 None None None None
Jerry Koosman Jul 2 KCR 9.1 38 L 4 4 10 5 2 0 None None None None
Roger Erickson Jul 3 @TEX 6.0 26 W 3 3 8 2 1 0 None None None None
Darrell Jackson Jul 4 @TEX 7.0 30 3 3 5 4 4 2 None None None None
Geoff Zahn Jul 5 @TEX 9.0 33 W 1 1 6 1 2 0 None None None None
Fernando Arroyo Jul 6 @TEX 7.2 28 W 0 1 3 2 0 0 None None None None
Jerry Koosman Jul 10 SEA 9.0 35 W 4 4 8 8 0 0 None None None None
Darrell Jackson Jul 11 SEA 7.2 30 W 3 3 6 8 2 1 None None None None
Geoff Zahn Jul 12 @SEA 8.0 30 W 3 3 8 0 2 0 None None None None
Roger Erickson Jul 13 @SEA 5.0 23 4 4 6 5 2 0 None None None None
Fernando Arroyo Jul 14 @SEA 4.1 22 L 4 6 5 0 3 1 None None None None
Jerry Koosman Jul 15 NYY 8.0 34 W 4 4 9 6 2 2 None None None None
Darrell Jackson Jul 16 NYY 3.0 19 L 7 7 7 0 3 0 None None None None
Geoff Zahn Jul 17 NYY 4.0 21 L 6 6 7 3 2 2 None None None None
Roger Erickson Jul 18 BOS 9.1 38 L 1 1 8 3 2 1 None None None None
Fernando Arroyo Jul 19 BOS 9.0 29 W 0 0 5 3 2 0 None None None None
Jerry Koosman Jul 20 BOS 3.0 17 4 4 7 1 1 0 None None None None
Darrell Jackson Jul 21 @BAL 2.1 17 5 5 8 1 3 0 None None None None
Geoff Zahn Jul 21 (2) @BAL 5.2 32 L 10 10 11 2 5 3 None None None None
Roger Erickson Jul 22 @BAL 4.2 23 L 7 7 8 4 2 1 None None None None
Fernando Arroyo Jul 23 @BAL 6.1 34 L 7 7 8 6 7 0 None None None None
Jerry Koosman Jul 25 @BOS 5.0 23 L 6 6 8 0 2 2 None None None None
Geoff Zahn Jul 25 (2) @BOS 9.0 36 W 0 0 9 8 1 0 None None None None
Roger Erickson Jul 26 @BOS 8.0 37 L 5 5 11 2 3 1 None None None None
Fernando Arroyo Jul 27 @BOS 1.2 11 3 3 6 0 0 0 None None None None
Darrell Jackson Jul 28 @NYY 7.1 32 3 4 8 3 2 0 None None None None
Geoff Zahn Jul 29 @NYY 9.0 35 W 2 2 10 3 0 0 None None None None
Jerry Koosman Jul 30 @NYY 10.0 38 W 1 1 3 4 5 0 None None None None
Roger Erickson Aug 1 BAL 7.0 31 1 2 8 3 3 0 None None None None
Fernando Arroyo Aug 2 BAL 4.0 20 L 5 5 5 2 3 0 None None None None
Darrell Jackson Aug 3 BAL 4.1 22 L 3 5 6 1 2 1 None None None None
Geoff Zahn Aug 4 OAK 0.2 10 L 8 8 6 0 2 1 None None None None
Jerry Koosman Aug 5 OAK 6.2 29 L 3 3 8 3 4 0 None None None None
Roger Erickson Aug 6 OAK 6.1 27 L 3 3 6 4 3 0 None None None None
Fernando Arroyo Aug 7 CAL 7.1 28 2 2 5 1 3 0 None None None None
Darrell Jackson Aug 8 CAL 4.0 19 L 5 5 7 3 1 1 None None None None
Geoff Zahn Aug 9 CAL 6.2 29 L 5 5 8 1 2 1 None None None None
Jerry Koosman Aug 10 CAL 7.2 31 W 1 2 9 6 1 1 None None None None
Roger Erickson Aug 12 @OAK 8.1 34 2 2 9 4 1 1 None None None None
Fernando Arroyo Aug 13 @OAK 5.1 22 L 4 4 6 1 2 1 None None None None
Darrell Jackson Aug 14 @OAK 10.0 38 1 1 6 4 3 0 None None None None
Geoff Zahn Aug 15 @CAL 8.0 35 L 5 5 11 2 1 1 None None None None
Roger Erickson Aug 17 @CAL 9.0 35 W 1 1 6 7 4 0 None None None None
Jerry Koosman Aug 17 (2) @CAL 7.1 33 W 5 5 9 5 2 2 None None None None
Fernando Arroyo Aug 18 @CAL 8.2 35 W 3 3 8 2 2 1 None None None None
Darrell Jackson Aug 19 @TOR 7.0 29 2 3 6 3 4 0 None None None None
Geoff Zahn Aug 20 @TOR 7.0 29 L 3 5 6 4 3 0 None None None None
Albert Williams Aug 21 @DET 7.0 29 W 3 3 7 6 4 0 None None None None
Roger Erickson Aug 21 (2) @DET 7.0 34 L 3 4 11 2 1 2 None None None None
Jerry Koosman Aug 22 @DET 7.2 34 5 5 11 6 0 1 None None None None
Darrell Jackson Aug 23 @DET 7.0 29 L 4 4 8 1 2 0 None None None None
Geoff Zahn Aug 24 @DET 9.0 37 L 3 3 7 4 7 1 None None None None
Fernando Arroyo Aug 25 CLE 5.0 23 L 4 4 6 0 2 1 None None None None
Roger Erickson Aug 26 CLE 8.0 30 W 1 1 7 1 2 0 None None None None
Jerry Koosman Aug 27 CLE 6.1 32 L 4 4 11 4 3 0 None None None None
Darrell Jackson Aug 28 TOR 7.0 28 4 4 8 5 2 1 None None None None
Geoff Zahn Aug 29 TOR 9.0 32 W 2 2 9 1 0 0 None None None None
Roger Erickson Aug 30 TOR 8.1 31 2 2 7 5 0 1 None None None None
Jerry Koosman Aug 31 TOR 5.2 28 L 4 7 9 5 1 1 None None None None
Albert Williams Sep 1 @CLE 8.1 39 L 5 5 7 4 7 2 None None None None
Darrell Jackson Sep 2 @CLE 7.2 30 W 3 3 6 6 1 0 None None None None
Geoff Zahn Sep 3 @CLE 0.2 8 L 2 5 4 0 1 0 None None None None
Roger Erickson Sep 5 DET 8.0 30 L 1 1 5 5 1 0 None None None None
Jerry Koosman Sep 6 DET 8.1 33 W 0 0 3 3 5 0 None None None None
Darrell Jackson Sep 7 DET 7.0 27 W 0 1 4 2 2 0 None None None None
Albert Williams Sep 9 @MIL 9.0 34 W 2 2 6 1 2 0 None None None None
Roger Erickson Sep 10 @MIL 9.0 33 L 3 3 7 5 0 1 None None None None
Jerry Koosman Sep 12 CWS 7.0 30 L 4 4 7 3 2 1 None None None None
Geoff Zahn Sep 13 CWS 7.0 29 W 3 3 8 2 1 1 None None None None
Albert Williams Sep 14 CWS 1.1 6 0 1 1 1 0 0 None None None None
Jerry Koosman Sep 17 MIL 9.0 36 W 2 2 8 8 2 0 None None None None
Roger Erickson Sep 17 (2) MIL 9.0 33 W 1 1 5 6 1 0 None None None None
Geoff Zahn Sep 18 MIL 1.2 12 0 7 5 0 1 1 None None None None
Pete Redfern Sep 18 (2) MIL 3.0 16 L 3 3 5 3 2 0 None None None None
Albert Williams Sep 19 @CWS 8.0 32 W 3 3 9 1 1 1 None None None None
Geoff Zahn Sep 21 @CWS 5.1 24 4 4 7 4 2 0 None None None None
Fernando Arroyo Sep 21 (2) @CWS 6.1 31 W 0 4 8 2 2 0 None None None None
Jerry Koosman Sep 22 @TEX 8.0 34 W 0 0 9 5 3 0 None None None None
Roger Erickson Sep 23 @TEX 5.0 27 W 2 2 8 2 4 0 None None None None
Albert Williams Sep 24 @TEX 9.0 36 W 5 5 8 3 2 2 None None None None
Geoff Zahn Sep 26 @KCR 9.0 31 W 0 0 6 8 1 0 None None None None
Jerry Koosman Sep 27 @KCR 9.0 34 W 2 3 3 5 4 1 None None None None
Roger Erickson Sep 28 @KCR 2.2 14 2 3 5 2 0 0 None None None None
Geoff Zahn Oct 2 TEX 6.1 30 W 3 3 8 3 3 0 None None None None
Albert Williams Oct 2 (2) TEX 9.0 35 W 1 1 9 4 2 1 None None None None
Jerry Koosman Oct 3 KCR 8.0 33 W 3 3 8 4 2 1 None None None None
Roger Erickson Oct 4 KCR 0.1 7 L 5 5 4 1 2 0 None None None None
Darrell Jackson Oct 5 KCR 5.0 20 L 2 3 2 2 3 1 None None None None