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Bill Mazeroski League
8-29-2129
Joe Slayback Relief Pitcher
Retired (2025, Age 35)
CAREER BIOGRAPHICAL DATA
ERA 5.05 Total Rating 67   Bats/Throws R/R
W-L 50-45 Status Deceased (2060) Option Years 0  
SV 45 Age at Death 71 Date of Birth 11-09-1989
K 575 Drafted Round 1, Pick 6
(2011)		 Majors Svc Time 10 years
(118 games)
IP 770.0
WHIP 1.51
OFFENSE PITCHING MENTORING
Contact vs. R 20 Contact vs. L 35 Endurance 36   Ldrship 41
Power vs. R 2 Power vs. L 3 Velocity 70   Mentor Val 64
Speed 53 Bunt 9 Control 65
POSITIONS DEFENSE/HEALTH POSTSEASON
 C * --- SS --- Range 17 WS Rings 0
1B --- LF --- Arm 34 WS Appearances 0
2B --- CF ---   Health 41 LCS Appearances 0
3B --- RF ---   Injured Days 0 All Star Teams 0
* League requires 50% rating to start at catcher.

Year   Team W L G GS CG SHO SV BS IP H R ER HBP BB SO WHIP ERA Awards
2013 BOS
0
 0
2
0
0
0
0
 0
2.1
 8 4 4 0 1
3
3.86
15.43
2014 BOS
2
 1
14
0
0
0
0
 0
22.0
 41 25 24 0 7
16
2.18
9.82
2015 BOS
2
 2
20
0
0
0
0
 2
36.0
 32 20 19 1 14
24
1.28
4.75
2016 BOS
5
 6
44
0
0
0
1
 4
59.0
 77 36 29 0 19
40
1.63
4.42
2017 BOS
12
 6
65
0
0
0
1
 4
79.0
 83 42 35 1 26
59
1.38
3.99
2018 BOS
1
 3
37
0
0
0
5
 3
48.2
 61 33 27 3 21
46
1.68
4.99
2019 BOS
0
 3
19
0
0
0
1
 2
46.1
 50 28 21 1 19
38
1.49
4.08
2020 BOS
8
 1
66
0
0
0
2
 4
72.0
 80 45 42 1 25
38
1.46
5.25
2021 BOS
4
 4
67
0
0
0
2
 3
85.1
 96 47 43 3 38
74
1.57
4.54
2022 BOS-SEA
8
 8
68
0
0
0
15
 5
90.0
 89 43 39 2 21
74
1.22
3.90
2023 SEA
3
 5
66
0
0
0
14
 4
86.2
 98 57 56 0 40
66
1.59
5.82
2024 SEA
4
 5
61
1
0
0
3
 7
119.0
 121 81 75 1 56
80
1.49
5.67
2025 SEA-KC
1
 1
12
0
0
0
1
 0
23.2
 30 25 18 1 9
17
1.65
6.85
2129
0
 0
0
0
0
0
0
 0
0.0
 0 0 0 0 0
0
0.00
0.00
Total
50
 45
541
1
0
0
45
 38
770.0
 866 486 432 14 296
575
1.51
5.05
Career Transactions
DateTransaction
2025-11-01Joe Slayback has retired from the Kansas City River Rats
2025-07-23The Kansas City River Rats have acquired Joe Slayback from the waiver wire.
2025-07-03The Seattle Fireballs have waived Joe Slayback.
2025-06-04The Seattle Fireballs have designated Joe Slayback for assignment.
2022-08-03Trade #1651147 has been completed between the Seattle Fireballs and the Boston Brahmins. The Boston Brahmins receive Bill Nekola, Draft Pick 2023 Round 2 SEA (Joe Ramirez) from the Seattle Fireballs in exchange for Joe Slayback.
2020-09-17Joe Slayback of the Boston Brahmins is injured and is expected to be out 23 days.
2020-08-20Joe Slayback of the Boston Brahmins is injured and is expected to be out 11 days.
2018-09-14Joe Slayback of the Boston Brahmins is injured and is expected to be out 15 days.
2016-09-29Joe Slayback of the Boston Brahmins is injured and is expected to be out 5 days.
2016-04-26Joe Slayback of the Boston Brahmins is injured and is expected to be out 12 days.
2015-04-11The Boston Brahmins have promoted Joe Slayback to the major league team. The Boston Brahmins have designated Eddie Romano for assignment.
2014-06-13The Boston Brahmins have sent Joe Slayback down to the minors.
2014-04-01The Boston Brahmins have promoted Joe Slayback to the major league team. The Boston Brahmins have sent Al Roper to the minors.
2013-05-30The Boston Brahmins have promoted Sam Rogovin to the major league team. The Boston Brahmins have sent Joe Slayback to the minors.
2013-05-24The Boston Brahmins have promoted Joe Slayback to the major league team. The Boston Brahmins have designated Jim Pignatano for assignment.