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Loïs Boisson (French pronunciation: [lɔis bwasɔ̃]; born 16 May 2003) is a French professional tennis player. She has a career-high singles ranking of No. 36 by the WTA, achieved on 3 November 2025. Her most notable result is reaching the semifinals of a major event at the 2025 French Open, on her main-draw debut, becoming the first wildcard player in the Open era to accomplish the feat. She is the current No. 1 singles player from France.
| W | F | SF | QF | | RR | Q# | DNQ | A | NH |
| Tournament | 2021 | 2022 | 2023 | 2024 | 2025 | SR | W–L | Win% |
| Grand Slam tournaments | ||||||||
| Australian Open | A | A | A | A | A | 0 / 0 | 0–0 | – |
| French Open | Q2 | Q1 | Q1 | A | SF | 0 / 1 | 5–1 | 83% |
| Wimbledon | A | A | A | A | Q1 | 0 / 0 | 0–0 | – |
| US Open | A | A | A | A | 1R | 0 / 1 | 0–1 | 0% |
| Win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 5–2 | 0 / 2 | 5–2 | 71% |
| WTA 1000 | ||||||||
| Qatar Open | NTI | A | NTI | A | A | 0 / 0 | 0–0 | – |
| Dubai | A | NTI | A | A | A | 0 / 0 | 0–0 | – |
| Indian Wells | A | A | A | A | A | 0 / 0 | 0–0 | – |
| Miami Open | A | A | A | A | A | 0 / 0 | 0–0 | – |
| Madrid Open | A | A | A | A | A | 0 / 0 | 0–0 | – |
| Italian Open | A | A | A | A | A | 0 / 0 | 0–0 | – |
| Canadian Open | A | A | A | A | A | 0 / 0 | 0–0 | – |
| Cincinnati Open | A | A | A | A | A | 0 / 0 | 0–0 | – |
| Guadalajara Open | NH | A | A | NTI | 0 / 0 | 0–0 | – | |
| China Open | NH | A | A | 0 / 0 | 0–0 | – | ||
| Wuhan Open | NH | A | 0 / 0 | 0–0 | – | |||
| Career statistics | ||||||||
| Tournaments | 0 | 0 | 0 | 0 | 5 | Total: 5 | ||
| Win–loss | 0–0 | 0–0 | 0–0 | 0–0 | 11–4 | 1 / 5 | 11–4 | 73% |
| Legend |
| Grand Slam |
| WTA 1000 |
| WTA 500 |
| WTA 250 (1–0) |
| Finals by surface |
| Clay (1–0) |
| Hard |
| Grass |
| Finals by setting |
| Outdoor (1–0) |
| Indoor |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Jul 2025 | Hamburg European Open, Germany | WTA 250 | Clay | Anna Bondár | 7–5, 6–3 |
| Result | W–L | Date | Tournament | Surface | Opponent | Score |
| Win | 1–0 | May 2024 | Open de Saint-Malo, France | Clay | Chloé Paquet | 4–6, 7–6(7–3), 6–3 |
| Legend |
| W75 tournaments (2–0) |
| W25/35 tournaments (2–2) |
| W15 tournaments (2–0) |
| Finals by surface |
| Hard |
| Clay (6–2) |
| Result | W–L | Date | Tournament | Tier | Surface | Opponent | Score |
| Win | 1–0 | Sep 2022 | ITF Dijon, France | W15 | Clay | Vivian Wolff | 7–5, 3–6, 7–5 |
| Win | 2–0 | Mar 2023 | ITF Le Havre, France | W15 | Clay (i) | Diana Martynov | 6–0, 4–6, 6–2 |
| Loss | 2–1 | Oct 2023 | ITF Seville, Spain | W25 | Clay | Dominika Šalková | 4–6, 3–6 |
| Win | 3–1 | Mar 2024 | ITF Alaminos, Cyprus | W35 | Clay | Despina Papamichail | 6–2, 6–0 |
| Win | 4–1 | Mar 2024 | ITF Terrassa, Spain | W35 | Clay | Hanne Vandewinkel | 6–0, 7–6(8) |
| Win | 5–1 | Mar 2024 | Bellinzona Ladies Open, Switzerland | W75 | Clay | Anna Bondár | 6–3, 2–6, 6–4 |
| Loss | 5–2 | Mar 2025 | ITF Terrassa, Spain | W35 | Clay | Lilli Tagger | 6–7(4), 3–6 |
| Win | 6–2 | May 2025 | Open Saint-Gaudens, France | W75 | Clay | Tatiana Prozorova | 7–6(4), 6–0 |
| Season | 2025 | Total |
| Wins | 2 | 2 |
| # | Opponent | Rk | Event | Surface | Rd | Score | LBR | |
| 2025 | ||||||||
| 1. | Jessica Pegula | 3 | French Open | Clay | 4R | 3–6, 6–4, 6–4 | 361 | |
| 2. | Mirra Andreeva | 6 | French Open | Clay | QF | 7–6(8–6), 6–3 | 361 | |