The Trefriw Open was a combined grass court tennis tournament founded in 1889. The tournament was organised by the Trefriw Improvement Company, and was played at the Conway Valley Grounds in Trefriw, Caernarfonshire, North Wales until 1903.
The winners of the men's open singles event were awarded the Nicholson Challenge Cup.
Finals Men's Singles Included: Year Winner Runner-Up Score 1889North Wales Chronicle (7 September 1889) p.5. Henry Fosbery Walter Shipman 6–0, 6–1, 6–0 1890 Henry Fosbery (2) K.B. Fuller won. 1894 Tancred Cummins William Heard 6–1, 2–6, 3–6, 6–4, 6–41895 Tancred Cummins (2) Charles Latham6-3, 6–3, 1–6, 6–31896 Arnold Wolff Norman Hallward6-3, 7–5, 3–6, 8–61897 John Boucher E. H. Powell6-2, 6–11898 John Boucher (2) A. H. Green 5–7, 7–5, 6–2, 6–41899 John Boucher (3) Frederick Canning6-0, 6–0, 6–21900 John Boucher (4) A. H. Green6-4, 3–6, 6–2, 1–6, 6–41901 John Boucher (5) Henry Evered 6-4, 6–1, 6–21902 John Boucher (6) A.H Green 6-4, 6–0, 6–21903 A.H. Green Frederick Canning 6-0, 6–1, 6–3
Women's Singles Year Winner Runner-UpScore1893 Miss Stoneax Mrs Ashwell6-4, retd.1895 Ruth Dyas Miss Murray4-6 6-3 7–51896 Ruth Dyas (2) Constance Hill 6-1 6–01897 Ruth Dyas (3) Constance Hill2-6 6-2 6–2 1898 Ruth Dyas (4) Constance Hill 6-0 6–01899 E. Makinson Ruth Durlacher walkover
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