Win Mercer
- Given Name
- George Barclay
- Born
- 6/20/1874 — Chester, WV, USA
- Died
- 1/12/1903 — San Francisco, CA, USA
- Weight
- 154 lbs
- Height
- 5' 9"
- Throws
- R
- Bats
- L
- Team(s)
- Washington Senators (1894–1901)New York Giants (1900)Detroit Tigers (1902)
- Debut
- 1894-04-21
- Final Game
- 1902-09-27
20-Loss Seasons
1895 · Washington SenatorsW13L23ERA4.42WHIP1.685
1894 · Washington SenatorsW17L23ERA3.85WHIP1.683
1897 · Washington SenatorsW21L20ERA3.18WHIP1.482