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| Name | Win Mercer |
| Given Name | George Barclay |
| Birth Date | 1874-6-20 |
| Birth City | Chester, WV |
| Height | 5'9" |
| Weight | 154 lbs. |
| Batting Hand | Left |
| Pitching Hand | Right |
| Alive | No |
| Age | 28 |
| Year | Team | Hits | At Bats | Home Runs | Runs Batted | Batting Average | Wins | Losses | # of Pitching Games | Strikeouts | # of Shutouts |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1894 | Washington Senators | 48 | 165 | 2 | 29 | 0.290909 | 17 | 23 | 50 | 72 | 0 |
| 1895 | Washington Senators | 50 | 196 | 1 | 26 | 0.255102 | 13 | 23 | 43 | 84 | 0 |
| 1896 | Washington Senators | 38 | 156 | 1 | 14 | 0.24359 | 25 | 18 | 46 | 94 | 2 |
| 1897 | Washington Senators | 44 | 139 | 0 | 19 | 0.316547 | 20 | 20 | 46 | 88 | 3 |
| 1898 | Washington Senators | 80 | 249 | 2 | 25 | 0.321285 | 12 | 18 | 33 | 52 | 0 |
| 1899 | Washington Senators | 112 | 375 | 1 | 35 | 0.298667 | 7 | 14 | 23 | 28 | 0 |
| 1900 | New York Giants | 73 | 248 | 0 | 27 | 0.294355 | 13 | 17 | 33 | 39 | 1 |
| 1901 | Washington Senators | 42 | 140 | 0 | 16 | 0.3 | 9 | 13 | 24 | 31 | 1 |
| 1902 | Detroit Tigers | 18 | 100 | 0 | 6 | 0.18 | 15 | 18 | 35 | 40 | 4 |
| Year | Position | Errors | Double Plays | Assists |
|---|---|---|---|---|
| 1894 | Outfielder | 1 | 0 | 1 |
| 1894 | Pitcher | 5 | 1 | 69 |
| 1895 | 2nd Base | 0 | 0 | 2 |
| 1895 | 3rd Base | 1 | 0 | 5 |
| 1895 | Outfielder | 0 | 0 | 0 |
| 1895 | Pitcher | 12 | 2 | 58 |
| 1895 | Shortstop | 12 | 1 | 11 |
| 1896 | Outfielder | 0 | 0 | 0 |
| 1896 | Pitcher | 21 | 3 | 89 |
| 1897 | Pitcher | 15 | 4 | 67 |
| 1898 | 2nd Base | 0 | 0 | 0 |
| 1898 | 3rd Base | 2 | 0 | 4 |
| 1898 | Outfielder | 3 | 0 | 0 |
| 1898 | Pitcher | 10 | 2 | 49 |
| 1898 | Shortstop | 14 | 6 | 63 |
| 1899 | 1st Base | 1 | 0 | 0 |
| 1899 | 3rd Base | 30 | 6 | 94 |
| 1899 | Outfielder | 6 | 1 | 3 |
| 1899 | Pitcher | 3 | 1 | 59 |
| 1899 | Shortstop | 0 | 0 | 0 |
| 1900 | 2nd Base | 1 | 1 | 10 |
| 1900 | 3rd Base | 17 | 2 | 51 |
| 1900 | Outfielder | 0 | 0 | 3 |
| 1900 | Pitcher | 6 | 3 | 67 |
| 1900 | Shortstop | 8 | 5 | 18 |
| 1901 | 1st Base | 4 | 7 | 2 |
| 1901 | 3rd Base | 0 | 0 | 0 |
| 1901 | Outfielder | 7 | 2 | 5 |
| 1901 | Pitcher | 4 | 1 | 50 |
| 1901 | Shortstop | 0 | 0 | 0 |
| 1902 | Pitcher | 8 | 2 | 103 |