Men's singles
1891 U.S. National Championships
Champion	Oliver Campbell
Runner-up	Clarence Hobart
Score	2–6, 7–5, 7–9, 6–1, 6–2

Defending champion Oliver Campbell defeated Clarence Hobart in the challenge round, 2–6, 7–5, 7–9, 6–1, 6–2 to win the men's singles tennis title at the 1891 U.S. National Championships.

Draw

Challenge round

	Challenge round
	O Campbell		2	7	7	6	6
	C Hobart		6	5	9	1	2

Finals

	Semifinals									Finals
	C Hobart		6	6	6
	VG Hall		2	4	2
										C Hobart		6	3	6	6	6
										F Hovey		4	6	4	8	0
	F Hovey		6	6	3	1	6
	M Smith		4	2	6	6	4

Earlier rounds

Section 1

	First round									Second round									Third round									Quarterfinals
	H Colby		6	4	6	6
	EK Rowland		1	6	1	1				H Colby		1	11	6	3	6
	FLV Hoppin		w/	o						FLV Hoppin		6	9	4	6	3
	FJ Bentley																		H Colby		0	6	0	4
	EL Hall		6	6	2	6													EL Hall		6	3	6	6
	M Fielding		2	3	6	4				EL Hall		5	7	6	6
	S McCormick		5	7	6	6				S McCormick		7	5	1	2
	W Hoopes		7	5	1	2																						EL Hall		6	4	9	4
	WV Johnson		6	6	6																							C Hobart		3	6	11	6
	S Woodward		2	2	2					WV Johnson		1	4	3
	C Hobart		8	6	6					C Hobart		6	6	6
	TP Borden		6	3	3														C Hobart		w/	o
	C Bunting		6	6	4	7	6												J Ryerson
	JA Hovey		4	8	6	5	4			C Bunting		1	2	4
	J Ryerson		6	6	6					J Ryerson		6	6	6
	ML Pratt		2	3	3

Section 2

	First round									Second round									Third round									Quarterfinals
	CT Lee		6	6	6
	H Satterlee		0	1	1					CT Lee		6	6	6
	WP Jenks		6	6	9					WP Jenks		1	1	2
	JF Turrill		0	0	7														CT Lee		6	6	6
	E Colby		11	4	6	7													W Larned		2	2	4
	BJ Carroll		9	6	3	5				E Colby		1	1	1
	W Larned		8	6	8					W Larned		6	6	6
	H McCormick		6	4	6																							CT Lee		4	4	6	0
	VG Hall		6	6	6																							VG Hall		6	6	0	6
	FM Pile		1	1	1					VG Hall		2	6	6	6
	R Stevens		2	6	4	6	6			R Stevens		6	2	4	1
	B Lamb		6	3	6	2	1												VG Hall		6	2	6	6
	ST Chase		6	6	6														ST Chase		4	6	2	3
	G Herrick		2	2	1					ST Chase		3	6	6	6
	B Huntington		w/	o						B Huntington		6	4	3	3
	R Johnson

Section 3

	First round									Second round									Third round									Quarterfinals
	F Hovey		6	6	6
	LR Parker		1	3	1					F Hovey		6	6	2	6
	HG Bixby		6	6	6					HG Bixby		3	4	6	4
	J Nichols		4	4	1														F Hovey		5	3	6	13	6
	PS Sears		5	6	6	10													PS Sears		7	6	2	11	2
	D Miller		7	3	2	3				PS Sears		6	6	2	7
	W Orcutt		6	10	6					W Orcutt		4	3	6	5
	EW Gould		3	8	1																							F Hovey		4	6	6	2	6
	H.I. Wilcox		6	2	6	6																						AWS Post		6	4	3	6	0
	WK Fowler		4	6	3	4				H.I. Wilcox		6	6	6
	CR Budlong		3	6	6	6				CR Budlong		4	2	2
	ES Rushmore		6	4	3	2													H.I. Wilcox		6	2	3	1
	AWS Post		6	6	6														AWS Post		0	6	6	6
	GT Scott		3	3	2					AWS Post		6	6	4	6
	GF Fearing		6	6	6					GF Fearing		3	3	6	4
	CA Brown		0	1	1

Section 4

	First round									Second round									Third round									Quarterfinals
	M Smith		7	6	6
	DW Candler		5	2	1					M Smith		6	6	6
	G Brown		6	6	8					G Brown		0	4	2
	BS de Garmendia		1	0	6														M Smith		6	6	6
	B O'Connor		6	7	8														B O'Connor		2	2	3
	GN Notion		0	5	6					B O'Connor		6	6	6
	PS Oscanyan		6	4	6	6				PS Oscanyan		3	2	1
	E Stille		2	6	4	3																						M Smith		6	6	6
	T Horton		6	6	6																							J Clark		1	0	4
	EA Thompson		2	2	2					T Horton		0	1	3
	J Clark		6	4	6	6				J Clark		6	6	6
	ES White		1	6	1	3													J Clark		6	6	6
	JHF Hunt		6	6	6														JHF Hunt		4	2	4
	AWS Post		3	4	1					JHF Hunt		w/	o
	A Empie Wright		w/	o						A Empie Wright
	WH Trotter

References

• Albiero, Alessandro; Carta, Andrea (2010). The Grand Slam Record Book Vol. 1. Monte Porzio Catone: Effepi Libri. p. 574. ISBN 978-88-6002-017-8.