The Essex County Cricket Club Open was an early men's and women's grass court tennis tournament held initially at Knighton, Essex in England in 1879 and finally at Leyton in 1888.
The Essex County Cricket Club Tennis Tournament was an early grass court tennis tournament held initially at Knighton in England in 1879.
It was part of the men's tennis tour.
The challenge round is the final round of a tournament, in which the winner of a single-elimination phase faces the previous year's champion (who plays only that one match).
The challenge round was used in the early history of tennis (from 1877 through 1921), but only in some tournaments (not all).