Christopher Philip Eaton (born 27 November 1987) is a British retired tennis player.

In February 2009, Eaton played what was then the longest tennis match in history, lasting 6 hours and 40 minutes, eventually beating James Ward 21–19 in the fifth set.

This was a playoff match to decide the Davis Cup team, but it was not sanctioned by the ATP, so was not an official record, and it was later broken.

[6] He then faced Russia's Dmitry Tursunov, the number 25 seed in the second round on Court One, his first show-court appearance.

Having played little more than a few Futures at the start of the year, Eaton was thrust into play-offs, between six British tennis hopefuls, designed by John Lloyd to help pick the two singles players to represent Great Britain in the Euro/Africa Zone Group I tie against Ukraine.

Lloyd had decided he had seen enough, and chose Eaton and Joshua Goodall as the two players to represent Britain alongside Colin Fleming and Ross Hutchins.

Eaton lost his first Davis Cup match 6–3, 3–6, 6–3, 6–4 to Ukrainian number 1 Sergiy Stakhovsky but managed to restore some pride to Team GB, who were on the verge of a whitewash before Eaton managed to beat Illya Marchenko 6–3, 4–6, 7–6 in the remaining dead rubber.

Despite putting in one of the better performances by British players other than Andy Murray in the Davis Cup recently, Eaton didn't appear in the plans of captain John Lloyd for forthcoming fixtures.

He joined the Wake Forest men's tennis staff as an assistant coach in the 2016–17 season.