# 1890 U.S. National Championships – Men's singles

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. It was the first of three U.S. Championships titles for Campbell.

## Draw
### Challenge round

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

### Finals

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

### Earlier rounds
#### Section 1

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

#### Section 2

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

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

#### Section 4

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