Men's singles
1890 U.S. National Championships
Final
Champion	Oliver Campbell
Runner-up	Henry Slocum
Score	6–2, 4–6, 6–3, 6–1
Events
Singles men women Doubles men women
← 1889 · U.S. National Championships · 1891 →

Oliver Campbell defeated the two-time defending champion Henry Slocum in the challenge round, 6–2, 4–6, 6–3, 6–1 to win the men's singles tennis title at the 1890 U.S. National Championships.^[1] It was the first of three U.S. Championships titles for Campbell.

	Challenge round
	H Slocum		2	6	3	1
	O Campbell		6	4	6	6

	Semifinals									Finals
	C Hobart		8	5	2
	P Knapp		10	7	6
										P Knapp		6	6	2	3
										O Campbell		8	0	6	6
	O Campbell		3	6	5	6	6
	B Huntington		6	2	7	2	1

	First round									Second round									Third round									Quarterfinals
										C Hobart		6	6	6
										GF Brown		1	3	1
																			C Hobart		6	6	6
																			M Chace		3	2	4
										M Chace		6	6	6	6	6
										D Miller		1	8	3	3	4
																												C Hobart		6	6	5	3	6
																												VG Hall		4	3	7	6	3
										VG Hall		6	6	6
										EW Gould		1	1	3
																			VG Hall		6	6	6
	H Tallant		6	6	6														H Tallant		2	3	3
	LJ Grant		1	0	0					H Tallant		6	6	6
	MR Wright		6	6	6					MR Wright		2	4	1
	C Bentley		1	1	3

	First round									Second round									Third round									Quarterfinals
	J Clark		6	6	6
	FW Smith		2	4	0					J Clark		6	7	6
	HM Billings		2	6	6	6				HM Billings		3	5	3
	SG Walker		6	3	4	1													J Clark		6	2	4	9
	CA Chase		6	6	6														CA Chase		2	6	6	11
	WK Fowler		2	4	2					CA Chase		6	2	7	6
	GP Herrick		2	6	6	6				GP Herrick		1	6	5	2
	A Rives		6	3	3	3																						CA Chase		2	8	3	3
	TP Borden		6	8	6																							P Knapp		6	6	6	6
	D Kimball		4	6	2					TP Borden		3	0	3
	M Smith		6	2	7	6				M Smith		6	6	6
	FLV Hoppin		4	6	6	2													M Smith		1	3	0
	P Knapp		6	6	6														P Knapp		6	6	6
	FA Kellogg		0	0	0					P Knapp		6	6	6	6
	P Manchester		8	6	6					P Manchester		1	2	8	3
	EA Tuttle		6	2	3

	First round									Second round									Third round									Quarterfinals
	JW Carver		5	6	6	6
	T Horton		7	0	1	2				JW Carver		6
	A Empie Wright		6	4	6	6				A Empie Wright		1	r
	BS de Garmendia		4	6	3	1													JW Carver		2	3	6
	O Campbell		6	6	6														O Campbell		6	6	5
	F Huntington		3	4	3					O Campbell		3	7	6	6
	SWB Moorehead		w/	o						SWB Moorehead		6	5	1	3
	HM Wilder																											O Campbell		6	7	6
	B Lamb		6	6	6																							J Ryerson		1	5	3
	EA Thompson		4	0	3					B Lamb		6	5	1	3
	J Ryerson		6	7	6					J Ryerson		3	7	6	6
	JHF Hunt		0	5	3														J Ryerson		5	4	6	6	6
	EL Hall		6	6	6														Keene		7	6	3	4	1
	WB Dinsmore		4	2	4					EL Hall		2	6	3	2
	Keene		w/	o						Keene		6	3	6	6
	WG Herrick

	First round									Second round									Third round									Quarterfinals
	PS Sears		6	6	6
	WF Metcalfe		1	0	0					PS Sears		4	6	6	6
	CP Howland		w/	o						CP Howland		6	4	3	4
	CE Sands																		PS Sears		6	6	2	4	5
	F Hovey		w/	o															B Huntington		2	3	6	6	7
	AA Chase									F Hovey		6	4	6	5	0
										B Huntington		3	6	3	7	6
																												B Huntington		5	6	6	6
																												GW Lee		7	1	1	1
										O Englestrom		w/	o
										R Sands
																			O Englestrom		4	4	2
																			GW Lee		6	6	6
										GW Lee		6	6	6
										C Byrnes		2	3	4

• Albiero, Alessandro; Carta, Andrea (2010). The Grand Slam Record Book Vol. 1. Monte Porzio Catone: Effepi Libri. p. 572. ISBN 978-88-6002-017-8.