# 1891 U.S. National Championships – Men's singles

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

### Finals

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

### Earlier rounds
#### Section 1

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

#### Section 2

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

#### Section 3

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

#### Section 4

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