Topzle Updated: Wikipedia source
Johannus Monday (born 22 January 2002) is a British tennis player. He has a career high singles ranking of No. 212, achieved on 27 October 2025. He has a career high doubles ranking of No. 192 achieved on 28 August 2023.
| Legend |
| ATP Challenger (0–1) |
| ITF WTT (8–0) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Jun 2022 | USA M15, South Bend | WTT | Hard | Sekou Bangoura | 6–3, 7–5 |
| Win | 2–0 | Aug 2022 | USA M25, Decatur | WTT | Hard | Ezekiel Clark | 6–3, 6–3 |
| Win | 3–0 | Jul 2024 | USA M25, East Lansing | WTT | Hard | Aidan McHugh | 6–2, 6–2 |
| Win | 4–0 | Oct 2024 | USA M25, Louisville | WTT | Hard | Tyler Zink | 6–2, 6–3 |
| Win | 5–0 | Oct 2024 | USA M25, Harlingen | WTT | Hard | Tadeas Paroulek | 6–0, 6–1 |
| Win | 6–0 | Oct 2024 | USA M25, Norman | WTT | Hard (i) | Juan Carlos Aguilar | 6–1, 6–3 |
| Win | 7–0 | Jan 2025 | UK M25, Sunderland | WTT | Hard (i) | Ryan Peniston | 6–4, 6–2 |
| Win | 8–0 | Mar 2025 | USA M25, Bakersfield | WTT | Hard (i) | Alex Rybakov | 6–2, 6–4 |
| Loss | 8–1 | Oct 2025 | MarketBeat Open, US | Challenger | Hard (i) | Patrick Kypson | 7–6(7–2), 6–7(4–7), 5–7 |
| Legend |
| ATP Challenger (3–0) |
| ITF World Tennis Tour (6–2) |
| Finals by surface |
| Hard (7–2) |
| Clay (0–0) |
| Grass (2–0) |
| Carpet (0–0) |
| Result | W–L | Date | Tournament | Tier | Surface | Partner | Opponents | Score |
| Win | 1–0 | Jun 2023 | Nottingham,United Kingdom | Challenger | Grass | Jacob Fearnley | Liam Broady Jonny O'Mara | 6–3, 6–7(6–8), [10–7] |
| Win | 2–0 | Jul 2023 | Great Britain M25,Roehampton | World Tennis Tour | Grass | Emile Hudd | Arthur Bouquier François Musitelli | 6–4, 7–5 |
| Loss | 2–1 | Jul 2023 | Great Britain M25,Roehampton | World Tennis Tour | Hard | Emile Hudd | Charles Broom George Houghton | 4–6, 6–4, [9–11] |
| Win | 3–1 | Aug 2023 | Great Britain M25,Roehampton | World Tennis Tour | Hard | Emile Hudd | Millen Hurrion Daniel Little | 7–5(10–8), 7–6(7–4) |
| Win | 4–1 | Aug 2023 | Great Britain M25, Aldershot | World Tennis Tour | Hard | Emile Hudd | Arthur Fery Anton Matusevich | 6–3, 3–6, [10–8] |
| Win | 5–1 | Oct 2023 | USA M15,Las Vegas | World Tennis Tour | Hard | Ángel Díaz Jalil | William Grant Andrés Andrade | 6–4, 6–4 |
| Loss | 5–2 | Oct 2023 | USA M25Columbus | World Tennis Tour | Hard | Shunsuke Mitsui | Robert Cash Bryce Nakashima | 5–7, 6–7(10–12) |
| Win | 6–2 | Jul 2024 | USA M25,Dallas | World Tennis Tour | Hard | Shunsuke Mitsui | Alexander Kotzen Tristan McCormick | 6–4, 6–4 |
| Win | 7–2 | Oct 2024 | USA M25,Louisville | World Tennis Tour | Hard | JJ Mercer | Jody Maginley Evan Zhu | 7–5, 6–4 |
| Win | 8–2 | Nov 2024 | Knoxville,United States | Challenger | Hard (i) | Patrick Harper | Micah Braswell Eliot Spizzirri | 6–2, 6–2 |
| Win | 9–2 | Oct 2025 | Lincoln, USA | Challenger | Hard | Patrick Harper | Aryan Shah Dhakshineswar Suresh | 6–4, 7–5 |