John Marks (tennis)

John M.P. Marks (born 9 December 1952) is a former professional tennis player from Australia.
Marks is best remembered for finishing runner-up in singles at the 1978 Australian Open, defeating Arthur Ashe in the semifinals. As a result of this slam final appearance, he achieved his career-high singles ranking of World No. 44, after entering the tournament ranked No. 177. Marks never won a singles title during his career, but won 7 doubles titles and reached the semifinals of the men's doubles at the 1978 US Open. As a junior, Marks won the Australian Open boys' doubles in 1971, partnering Michael Phillips.
Grand Slam tournament performance timeline.
Singles.
Note: The Australian Open was held twice in 1977, in January and December.