1918 U.S. National Championships – Women's singles

Molla Bjurstedt defeated Eleanor Goss 6–4, 6–3 in the challenge round to win the women's singles tennis title at the 1918 U.S. National Championships. The event was played on outdoor grass courts and held at the Philadelphia Cricket Club in Chestnut Hill, Philadelphia in the United States from June 17 through June 22, 1918. It was the last edition of the event with a challenge round.

Women's singles
1918 U.S. National Championships
Champion	Molla Bjurstedt
Runner-up	Eleanor Goss
Score	6–4, 6–3
Draw	37
Seeds	–

Draw

Challenge round

	Challenge Round
	Molla Bjurstedt		6	6
	Eleanor Goss		4	3

Final eight

	Quarterfinals							Semifinals							Finals
	Dorothy Walker		1	0
	Helene Pollak		6	6
								Helene Pollak		6	6
								Clare Cassel		3	0
	Clare Cassel		6	6
	Eleanora Sears		2	2
															Helene Pollak		6	7
															Eleanor Goss		2	5
	Helen Ledoux		6	6
	Barbara Hooker		4	1
								Helen Ledoux		3	4
								Eleanor Goss		6	6
	Emily Stokes Weaver		2	4
	Eleanor Goss		6	6