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| John Kostas Career Regular Season | Career Post Season Career Batting | Career Pitching | Career Fielding |
By Date |
| League | Team | G | PO | A | E | FPC | |
| Boston MABL | Team | G | PO | A | E | FPC | |
| 2008 Boston MABL | Cutters | 14 | 15 | 16 | 1 | .969 | |
| 2009 Boston MABL | Cutters | 13 | 8 | 27 | 1 | .972 | |
| 2011 Boston MABL | Cutters | 13 | 4 | 2 | 4 | .600 | |
| 2012 Boston MABL | Cutters | 4 | 0 | 0 | 0 | .000 | |
| 2014 Boston MABL | Cutters | 5 | 0 | 0 | 0 | .000 | |
| 2021 Boston Baseball 18+ | Milton Fighting Irish | 1 | 0 | 0 | 0 | .000 | |
| League Totals | 50 | 27 | 45 | 6 | .923 | ||
| Boston MSBL 30+ | Team | G | PO | A | E | FPC | |
| 2014 Boston National MSBL | Braintree Braves | 8 | 1 | 4 | 0 | 1.000 | |
| 2016 Boston MSBL 28+ | Waltham Braves | 10 | 0 | 0 | 0 | .000 | |
| 2018 Boston MSBL 28+ | South Shore Spartans | 1 | 1 | 0 | 0 | 1.000 | |
| 2019 Boston MSBL 28+ | South Shore Spartans | 1 | 0 | 0 | 0 | .000 | |
| 2021 Boston MSBL 28+ | South Shore Spartans | 11 | 5 | 11 | 1 | .941 | |
| League Totals | 31 | 7 | 15 | 1 | .957 | ||
| Yawkey League | Team | G | PO | A | E | FPC | |
| 2004 Yawkey League | Savin Hill Hornets | 23 | 32 | 31 | 8 | .887 | |
| 2005 Yawkey League | AlThomas Athletics | 5 | 0 | 6 | 0 | 1.000 | |
| 2006 Yawkey League | AlThomas Athletics | 9 | 3 | 11 | 1 | .933 | |
| 2007 Yawkey League | AlThomas Athletics | 23 | 64 | 25 | 9 | .908 | |
| 2008 Yawkey League | AlThomas Athletics | 25 | 43 | 32 | 8 | .904 | |
| 2009 Yawkey League | AlThomas Athletics | 27 | 56 | 59 | 11 | .913 | |
| 2010 Yawkey League | AlThomas Athletics | 26 | 51 | 35 | 7 | .925 | |
| 2011 Yawkey League | AlThomas Athletics | 30 | 51 | 63 | 17 | .870 | |
| 2012 Yawkey League | AlThomas Athletics | 30 | 46 | 49 | 15 | .864 | |
| 2013 Yawkey League | AlThomas Athletics | 27 | 85 | 36 | 3 | .976 | |
| 2014 Yawkey League | AlThomas Athletics | 15 | 21 | 32 | 2 | .964 | |
| 2015 Yawkey League | AlThomas Athletics | 22 | 107 | 9 | 2 | .983 | |
| 2016 Yawkey League | AlThomas Athletics | 29 | 24 | 45 | 4 | .945 | |
| 2017 Yawkey League | AlThomas Athletics | 24 | 85 | 6 | 5 | .948 | |
| League Totals | 315 | 668 | 439 | 92 | .923 | ||
| Boston Park League | Team | G | PO | A | E | FPC | |
| 2014 Boston Park League | Grossman Marketing | 1 | 0 | 0 | 0 | .000 | |
| 2018 Boston Park League | Boston Athletics | 16 | 73 | 3 | 3 | .962 | |
| 2019 Boston Park League | Boston Athletics | 9 | 30 | 5 | 3 | .921 | |
| 2021 Boston Park League | Boston Athletics | 3 | 13 | 0 | 0 | 1.000 | |
| 2022 Boston Park League | Boston Athletics | 4 | 2 | 6 | 1 | .889 | |
| 2023 Boston Park League | Boston Athletics | 1 | 0 | 0 | 0 | .000 | |
| League Totals | 34 | 118 | 14 | 7 | .950 | ||
| G | PO | A | E | FPC | |||
| Totals | 430 | 820 | 513 | 106 | .926 | ||
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