The Waterbury Cup Invitation was a mens USNLTA affiliated grass court tournament founded in 1889. It was played at the Westchester Country Club, Harrison, New York in the United States until 1890.Gill Hall (Ed), Valentine (1891). Wright and Ditson's Lawn Tennis Guide: Chapter: Tournaments of 1890. Wright & Ditson Publishers. pp. 41, 42.

Finals Singles YearWinnersRunners-upScore1889 Howard A. Taylor Henry Slocum def.1890 Howard A. Taylor (2) Charles Sands 6-1, 6-1, 6-2

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