Jack Aker

Pitcher · Career Stats, Bio & Records (1964-1974)

Jack Aker was a pitcher who played in Major League Baseball from 1964 to 1974 for 7 teams, including the Kansas City Athletics, a span of 11 seasons. Across 495 career appearances, he went 47-45 with a 3.28 ERA, 404 strikeouts, and 123 saves.

W (Wins):
Games credited to a pitcher whose team took a lead it never surrendered while he was the pitcher of record.
ERA (Earned Run Average):
Earned runs allowed per nine innings pitched: (ER × 9) ÷ IP. The primary measure of pitching effectiveness.
SO (Strikeouts):
For a batter, times retired on a third strike; for a pitcher, batters retired on a third strike.
WHIP (Walks and Hits per Inning Pitched):
Baserunners allowed per inning: (BB + H) ÷ IP. Under 1.00 is elite.

Data updated

W–L 47–45
ERA 3.28
WHIP 1.28
SO 404
Pitcher PIV -5935.5
Position
Pitcher
Bats / Throws
R / R
Height / Weight
6'2" / 190 lb
Born
7/13/1940 in Tulare, CA, USA
MLB Debut
1964-05-03
Last Game
1974-09-27

Full name: Jackie Delane Aker

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Career Pitching Statistics

Jack Aker — Career Pitching Statistics
W L G GS CG SHO SV IP H ER HR BB SO ERA Pitcher PIV
47 45 495 0 0 0 123 746.0 679 272 64 274 404 3.28 -5935.5

Career ERA 3.28 vs. league average 3.51 across their career seasons — 6.5% better than league average.

Season-by-Season Pitching

Pitching Career Arc

Click a stat to plot it across every season.

Jack Aker Stats, Bio & Career Records
Year Team Lg W L G GS CG SHO SV IP H ER BB SO ERA Lg ERA Pitcher PIV
1964 KC1 AL 0 1 9 0 0 0 0 16.1 17 16 10 7 8.82 3.58 (-146%) -2401.6
1965 KC1 AL 4 3 34 0 0 0 3 51.1 45 18 18 26 3.16 3.50 (+10%) 9.8
1966 KC1 AL 8 4 66 0 0 0 32 113.0 81 25 28 68 1.99 3.52 (+43%) 1564.5
1967 KC1 AL 3 8 57 0 0 0 12 88.0 87 42 32 65 4.30 3.30 (-30%) -618.3
1968 OAK AL 4 4 54 0 0 0 11 74.2 72 34 33 44 4.10 2.98 (-37%) -1560.7
1969 SE1 AL 0 2 15 0 0 0 3 16.2 25 14 13 7 7.56 3.61 (-109%) -1539.9
1969 NYA AL 8 4 38 0 0 0 11 65.2 51 15 22 40 2.06 3.61 (+43%) 570.4
1970 NYA AL 4 2 41 0 0 0 16 70.0 57 16 20 36 2.06 3.89 (+47%) 1225.5
1971 NYA AL 4 4 41 0 0 0 4 55.2 48 16 26 24 2.59 3.47 (+25%) -308.9
1972 NYA AL 0 0 4 0 0 0 0 6.0 5 2 3 1 3.00 — 0.0
1972 CHN NL 6 6 48 0 0 0 17 67.0 65 22 23 36 2.96 3.26 (+9%) -151.2
1973 CHN NL 4 5 47 0 0 0 12 63.2 76 29 23 25 4.10 3.75 (-9%) -1346.3
1974 ATL NL 0 1 17 0 0 0 0 16.2 17 7 9 7 3.78 3.63 (-4%) -862.9
1974 NYN NL 2 1 24 0 0 0 2 41.1 33 16 14 18 3.48 3.63 (+4%) -515.9
Career · 14 seasons 47 45 495 0 0 0 123 746.0 679 272 274 404 3.28 — -5,935

Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.

Career Batting Statistics

Jack Aker — Career Batting Statistics
G AB R H 2B 3B HR RBI SB BB SO AVG OBP SLG OPS PIV
496 92 3 7 2 0 0 4 0 1 51 .076 .096 .098 .194 0

Career AVG .076 vs. league average .249 across their career seasons — 69.4% below league average.

Career OBP .096 vs. league average .315 across their career seasons — 69.6% below league average.

Career SLG .098 vs. league average .368 across their career seasons — 73.4% below league average.

Career OPS .194 vs. league average .683 across their career seasons — 71.7% below league average.

Season-by-Season Batting

Career Arc

Click a stat to plot it across every season.

Jack Aker Stats, Bio & Career Records
Year Team Lg G AB R H 2B 3B HR RBI SB BB SO AVG Lg AVG Lg OBP Lg SLG Lg OPS PIV
1964 KC1 AL 10 3 0 0 0 0 0 0 0 0 2 .000 — — — — 0.0
1965 KC1 AL 34 8 0 0 0 0 0 0 0 0 7 .000 — — — — 0.0
1966 KC1 AL 66 21 1 2 1 0 0 2 0 0 12 .095 — — — — 0.0
1967 KC1 AL 57 8 0 1 0 0 0 1 0 0 4 .125 — — — — 0.0
1968 OAK AL 54 7 1 1 0 0 0 0 0 0 5 .143 — — — — 0.0
1969 SE1 AL 15 1 0 0 0 0 0 0 0 0 1 .000 — — — — 0.0
1969 NYA AL 38 9 0 1 0 0 0 0 0 0 5 .111 — — — — 0.0
1970 NYA AL 41 16 0 1 0 0 0 1 0 0 6 .062 — — — — 0.0
1971 NYA AL 41 3 0 0 0 0 0 0 0 0 3 .000 — — — — 0.0
1972 NYA AL 4 0 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
1972 CHN NL 48 6 0 0 0 0 0 0 0 1 3 .000 — — — — 0.0
1973 CHN NL 47 7 0 0 0 0 0 0 0 0 3 .000 — — — — 0.0
1974 ATL NL 17 1 0 0 0 0 0 0 0 0 0 .000 — — — — 0.0
1974 NYN NL 24 2 1 1 1 0 0 0 0 0 0 .500 — — — — 0.0
Career · 14 seasons 496 92 3 7 2 0 0 4 0 1 51 .076 — — — — 0

Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.

Game Log & Splits

View full game log (991 games) →

Per-game data from Retrosheet (regular season, through 2025).

Batting — Home / Away

Jack Aker — Batting — Home / Away
SplitGABRHHRRBIAVG
Home250401302.075
Away246522402.077

Pitching — Home / Away

Jack Aker — Pitching — Home / Away
SplitGIPHERBBSOERA
Home250367.23161171271762.86
Away245378.23621551472283.68

Last 10 Games — Batting

Jack Aker — Last 10 Games — Batting
DateTmOppResABRH2B3BHRRBIBBSO
1974-09-27 NYNPITL 000000000
1974-09-26 NYNPITL 000000000
1974-09-25 NYNPHIL 000000000
1974-08-23 NYNATLL 000000000
1974-08-17 NYNCINL 000000000
1974-08-11 NYNCINL 000000000
1974-08-10 NYNCINL 000000000
1974-08-07 NYNPITL 000000000
1974-08-06 NYNPITL 100000000
1974-08-01 NYNCHCL 000000000

Last 10 Games — Pitching

Jack Aker — Last 10 Games — Pitching
DateTmOppDecIPHRERBBSOHR
1974-09-27 NYNPIT — 1.0000100
1974-09-26 NYNPIT — 1.0000000
1974-09-25 NYNPHI — 3.0000030
1974-08-23 NYNATL — 2.0110210
1974-08-17 NYNCIN — 2.0010110
1974-08-11 NYNCIN — 0.2244211
1974-08-10 NYNCIN — 1.0000010
1974-08-07 NYNPIT — 1.0211210
1974-08-06 NYNPIT — 1.2555011
1974-08-01 NYNCHC — 3.0211010

Fielding Statistics

Career Fielding Totals by Position

Jack Aker — Career Fielding Totals by Position
Position G GS PO A E DP
P 495 0 65 167 8 20

Season-by-Season Fielding

Jack Aker — Season-by-Season Fielding
Year Team Pos G GS PO A E DP
1964 KC1 P 9 0 2 5 0 1
1965 KC1 P 34 0 4 11 0 2
1966 KC1 P 66 0 9 32 0 1
1967 KC1 P 57 0 7 19 0 3
1968 OAK P 54 0 2 14 1 1
1969 SE1 P 15 0 3 4 0 2
1969 NYA P 38 0 11 14 0 2
1970 NYA P 41 0 4 11 1 0
1971 NYA P 41 0 10 12 3 0
1972 NYA P 4 0 3 2 0 1
1972 CHN P 48 0 2 18 1 3
1973 CHN P 47 0 6 17 1 3
1974 ATL P 17 0 2 4 1 1
1974 NYN P 24 0 0 4 0 0

Career Games by Position

Position Diamond

Circle size = games played at each position.

Jack Aker Stats, Bio & Career Records
Position Games
Pitcher 495

Awards & Honors

Jack Aker — Awards & Honors
Year Award Notes
1966 TSN Fireman of the Year

College History

Jack Aker — College History
School Name City State Years Attended
College of the Sequoias Visalia CA 1959

Award Voting History

Jack Aker — Award Voting History
Year Award League Finish Points Won Points Max Votes First
1966 Most Valuable Player AL 13th 22.0 280 0

Most Similar Players

Career comps based on counting + rate stats and primary position. Score is relative — closest peer anchors at ~98%.

Career Spans

Jack Aker (highlighted) compared to peers across the same era.

  1. 98
    Fred Gladding
    48-34, 3.13 ERA
  2. 91
    Tom Niedenfuer
    36-46, 3.29 ERA
  3. 91
    Wayne Granger
    35-35, 3.14 ERA
  4. 90
    Elias Sosa
    59-51, 3.32 ERA
  5. 87
    Ken Sanders
    29-45, 2.97 ERA
  6. 85
    Ed Roebuck
    52-31, 3.35 ERA

Jack Aker: the record in brief

May 3, 1964 and September 27, 1974 bracket Jack Aker's time in the majors: the debut and the last game on record. The team column moves through the Kansas City Athletics (1964 to 1967), the Oakland Athletics (1968), the Seattle Pilots (1969), the New York Yankees (1969 through 1972), the Chicago Cubs (1972 to 1973), the Atlanta Braves (1974), and the New York Mets (1974). The bio lists Aker as a pitcher who both batted and threw right-handed. The recorded size is 6 feet, 2 inches and 190 pounds. The birth record reads July 13, 1940, in Tulare, CA, USA. The given name on file is Jackie Delane Aker.

Aker's career pitching line is 47 wins, 45 losses and a 3.28 ERA over 495 appearances. The totals include 404 strikeouts and 123 saves. Against a 3.51 league ERA for the same years, Aker was 6.5% better. The best win total was 8, in 1966. Aker saved 32 games in 1966, the season high. 1966 was Aker's sharpest full season, a 1.99 ERA against the league's 3.52.

Frequently Asked Questions about Jack Aker

What years did Jack Aker play?
Jack Aker played in Major League Baseball from 1964 to 1974.
Was Jack Aker a pitcher?
Yes. Jack Aker pitched in the major leagues, recording 47 wins and 404 strikeouts.
How many home runs did Jack Aker hit?
Jack Aker hit 0 career home runs with 7 hits.
What was Jack Aker's career batting average?
Jack Aker batted .076 over his career, with 7 hits in 92 at bats.
How many RBI did Jack Aker have?
Jack Aker drove in 4 runs in his career.
What was Jack Aker's career ERA?
Jack Aker finished with a 3.28 career ERA, going 47-45 with 404 strikeouts.