Career
Knapp reached the All-Comers final of the United States. National Championships in 1885 and 1890 and the semifinals in 1884 and 1889. All-Comers Finals (2).
Knapp reached the All-Comers final of the United States. National Championships in 1885 and 1890 and the semifinals in 1884 and 1889. All-Comers Finals (2).
