| RORichard OliverWLS6 matches, 2023 to 2024 | 1,433.8 | | | | 11 Oct 2024 | Open |
| DODarren Olivero6 matches, 2024 to 2025 | 1,361.8 | | | | 15 Apr 2025 | Open |
| HOHelen OliveroGI3 matches, 2024 to 2026 | 1,491.6 | | 30.64 | 1-1 | 5 Jul | Open |
| KOKean Olivero11 matches, 2022 to 2025 | 1,448.0 | | | | 15 Apr 2025 | Open |
| RORamon OliverosPH2 matches, 2019 | 1,459.3 | | | | 31 Mar 2019 | Open |
| JOJ. C. Olivier8 matches, 2023 | 1,424.6 | | | | 23 Sep 2023 | Open |
| SOSamu OlkkonenFI9 matches, 2026 | 1,476.6 | | 73.94 | 4-5 | 13 Jun | Open |
| JOJere Ollanketo1 matches, 2023 | 1,477.4 | | | | 10 Sep 2023 | Open |
| OOOden OllevierBE102 matches, 2024 to 2026 | 1,661.1 | +0.0 | 63.79 | 48-32 | 2 Aug | Open |
| SOSteffen Olling2 matches, 2023 | 1,505.1 | | | | 30 Apr 2023 | Open |
| DODavid Ollinger40 matches, 2026 | 1,654.3 | +19.6 | 68.87 | 30-10 | 20 Sep | Open |
| EOEgzon Olluri3 matches, 2022 | 1,441.4 | | | | 3 Dec 2022 | Open |
| GOGraeme Olney5 matches, 2023 | 1,454.1 | | | | 13 May 2023 | Open |
| JOJonas OlovssonSE9 matches, 2020 to 2022 | 1,428.0 | | | | 20 Aug 2022 | Open |
| AOAllan Daugbjerg OlsenDK4 matches, 2022 | 1,539.7 | | | | 28 Jan 2022 | Open |
| AOAndreas OlsenNO8 matches, 2022 to 2025 | 1,356.0 | | | | 3 Aug 2025 | Open |
| COConner Olsen5 matches, 2026 | 1,591.0 | | 69.89 | 5-0 | 16 Aug | Open |
| HOHans Eivind Olsen6 matches, 2022 | 1,543.3 | | | | 28 May 2022 | Open |
| HOHans Marius Olsen4 matches, 2022 | 1,432.5 | | | | 18 Mar 2022 | Open |
| HOHavard Otelius Olsen6 matches, 2026 | 1,583.3 | | 49.62 | 5-1 | 31 Jul | Open |
| HOHenriette Olsen2 matches, 2024 | 1,447.1 | | | | 26 Nov 2024 | Open |
| HOHenriette Schultz Olsen1 matches, 2024 | 1,481.4 | | | | 4 May 2024 | Open |
| JOJógvan Videro Olsen5 matches, 2022 | 1,459.4 | | | | 18 Mar 2022 | Open |
| KOKjell Erik Olsen4 matches, 2026 | 1,417.6 | | 39.97 | 0-4 | 31 Jul | Open |
| KOKristian Olsen3 matches, 2023 | 1,496.1 | | | | 30 Apr 2023 | Open |
| LOLisbeth Tomle Olsen1 matches, 2024 | 1,473.2 | | | | 4 May 2024 | Open |
| MOMichael Olsen1 matches, 2023 | 1,477.2 | | | | 30 Apr 2023 | Open |
| MOMorten OlsenDK7 matches, 2019 to 2022 | 1,453.2 | | | | 30 Jan 2022 | Open |
| NONicolai OlsenDK3 matches, 2019 to 2023 | 1,466.7 | | | | 30 Apr 2023 | Open |
| POPhilip OlsenDK8 matches, 2026 | 1,539.2 | | 67.33 | 5-3 | 24 May | Open |
| RORani Olsen1 matches, 2026 | 1,468.2 | | 51.05 | 0-1 | 28 Mar | Open |
| RORói Olsen5 matches, 2022 | 1,482.7 | | | | 18 Mar 2022 | Open |
| RORúni Olsen5 matches, 2022 | 1,485.4 | | | | 18 Mar 2022 | Open |
| SOStefan Olsen2 matches, 2023 | 1,440.6 | | | | 30 Apr 2023 | Open |
| COConner OlsonUS92 matches, 2026 | 1,635.1 | -48.9 | 66.62 | 59-33 | 5 Oct | Open |
| DODan OlsonCA21 matches, 2007 to 2019 | 1,522.1 | | | | 11 Aug 2019 | Open |
| JOJeff OlsonUS5 matches, 2022 to 2024 | 1,476.0 | | | | 20 Jan 2024 | Open |
| JOJoey Olson1 matches, 2024 | 1,481.0 | | | | 21 Jan 2024 | Open |
| KOKyle Olson1 matches, 2022 | 1,480.0 | | | | 14 Jan 2022 | Open |
| MOMichele Olson2 matches, 2022 to 2023 | 1,463.8 | | | | 22 Jan 2023 | Open |
| RORyan Olson1 matches, 2022 | 1,482.8 | | | | 5 Aug 2022 | Open |
| VOValorie OlsonUS2 matches, 2024 | 1,510.2 | | | | 20 Jan 2024 | Open |
| AOAndre Almgren Olsson4 matches, 2023 | 1,492.0 | | | | 20 Aug 2023 | Open |
| AOAndrew OlssonUS5 matches, 2021 to 2024 | 1,455.3 | | | | 16 Nov 2024 | Open |
| COCasper Olsson3 matches, 2026 | 1,467.0 | | 49.05 | 1-2 | 23 Aug | Open |
| COChristoffer OlssonSE1 matches, 2025 | 1,475.5 | | | | 29 Mar 2025 | Open |
| NONiklas OlssonSE45 matches, 2019 to 2025 | 1,385.8 | | | | 30 Mar 2025 | Open |
| DODo OlsthoornNL1 matches, 2026 | 1,480.7 | | 63.00 | 0-1 | 26 Sep | Open |
| GOGiulia OlteanuRO40 matches, 2022 to 2026 | 1,555.0 | +0.0 | 57.53 | 12-5 | 28 Jun | Open |
| GOGiulia Olteanuu2 matches, 2026 | 1,513.6 | | 62.03 | 1-1 | 3 Oct | Open |
| RORianne OlthuisNL19 matches, 2024 to 2026 | 1,500.4 | | 53.67 | 8-6 | 4 Jul | Open |
| COChristoph OltmannsDE9 matches, 2025 to 2026 | 1,458.4 | | 69.44 | 2-6 | 25 Jul | Open |
| AOAdam Olver2 matches, 2025 | 1,451.2 | | | | 26 Jan 2025 | Open |
| OOOrgilsaikhan olziibayar1 matches, 2025 | 1,482.3 | | | | 15 May 2025 | Open |
| JOJargalsaikhan olziibuyan1 matches, 2025 | 1,480.7 | | | | 15 May 2025 | Open |
| JOJoel OmacPH8 matches, 2024 to 2026 | 1,491.9 | | 71.48 | 2-2 | 2 Aug | Open |
| MOMarion Christopher OmacPH20 matches, 2023 to 2026 | 1,585.5 | +0.0 | 82.14 | 3-4 | 2 Aug | Open |
| MOMarion Omac6 matches, 2024 | 1,519.5 | | | | 20 Apr 2024 | Open |
| COCrisologo OmaguingPH19 matches, 2025 to 2026 | 1,552.2 | | 73.93 | 3-6 | 13 Sep | Open |
| JOJaxon Oman11 matches, 2026 | 1,504.6 | | 52.38 | 6-5 | 18 Sep | Open |
| AOAzariah Bin OmarAU7 matches, 2026 | 1,564.5 | | 39.15 | 5-2 | 3 Jan | Open |
| MOMohd Razali Bin Omar1 matches, 2025 | 1,477.6 | | | | 10 Aug 2025 | Open |
| WOWycliff Omariba40 matches, 2026 | 1,706.6 | +14.1 | 65.82 | 31-9 | 19 Sep | Open |
| WOWycliffe Omariba13 matches, 2024 to 2026 | 1,577.0 | | 67.62 | 6-3 | 20 Sep | Open |
| SOSara Omarsdottir2 matches, 2026 | 1,507.0 | | 36.97 | 1-1 | 11 Apr | Open |
| AOAngelo James OmbayPH7 matches, 2024 | 1,533.3 | | | | 20 Apr 2024 | Open |
| VOVladyslav OmelchenkoUA9 matches, 2022 to 2026 | 1,533.3 | | | 0-1 | 3 Oct | Open |
| JOJosielyn Omelko1 matches, 2024 | 1,483.8 | | | | 11 Oct 2024 | Open |
| EOEvagoras Omirou6 matches, 2023 to 2026 | 1,518.0 | | 69.97 | 0-1 | 16 May | Open |
| WOWilfredo OmliPH3 matches, 2019 | 1,525.8 | | | | 31 Mar 2019 | Open |
| HOHumphrey van Ommen2 matches, 2024 | 1,497.4 | | | | 4 Feb 2024 | Open |
| YOYuya OmomoJP3 matches, 2019 to 2024 | 1,486.5 | | | | 16 Mar 2024 | Open |
| BOBenard Oduor Omondi7 matches, 2025 | 1,353.4 | | | | 27 Jul 2025 | Open |
| BOBenard Omondi19 matches, 2025 to 2026 | 1,303.5 | | 43.17 | 2-12 | 23 May | Open |
| BOBernard Omondi2 matches, 2025 to 2026 | 1,503.3 | | 31.46 | 1-0 | 14 Mar | Open |
| AOAugustine Omongo1 matches, 2025 | 1,488.5 | | | | 27 Jul 2025 | Open |
| HOHakan Onal1 matches, 2026 | 1,475.9 | | 55.66 | 0-1 | 23 Jan | Open |
| KOKiyokazu OndaJP10 matches, 2019 to 2022 | 1,303.4 | | | | 17 Jul 2022 | Open |
| SOStijn OnderstalNL1 matches, 2026 | 1,474.2 | | 47.47 | 0-1 | 12 Apr | Open |
| MOMichal OndoCZ23 matches, 2019 to 2025 | 1,575.5 | +0.0 | | | 16 Nov 2025 | Open |
| JOJakub OndrijaSK6 matches, 2024 to 2026 | 1,436.1 | | 58.61 | 1-3 | 2 Aug | Open |
| SOStuart Oneil3 matches, 2023 | 1,514.5 | | | | 19 Mar 2023 | Open |
| LOLee Oneill1 matches, 2026 | 1,475.0 | | 73.23 | 0-1 | 22 Aug | Open |
| MOMason Oneill1 matches, 2023 | 1,484.3 | | | | 7 May 2023 | Open |
| WOWycliff Onetouch32 matches, 2024 to 2025 | 1,609.5 | | | | 27 Sep 2025 | Open |
| COCheng Gaik OngMY4 matches, 2025 | 1,413.2 | | | | 4 May 2025 | Open |
| JOJun Jie (Edison) OngSG4 matches, 2025 | 1,425.5 | | | | 6 Jul 2025 | Open |
| SOSeng Chuan OngSG5 matches, 2025 | 1,441.3 | | | | 6 Jul 2025 | Open |
| SOSeng Hoe Max OngSG3 matches, 2024 | 1,463.9 | | | | 11 Aug 2024 | Open |
| WOWei Chian (Joden) OngMY4 matches, 2024 | 1,471.1 | | | | 19 May 2024 | Open |
| WOWilmer OngPH35 matches, 2019 to 2026 | 1,513.2 | +0.0 | 64.30 | 0-1 | 24 Jan | Open |
| RORichard OnionsENG9 matches, 2018 to 2026 | 1,355.1 | | 49.23 | 1-4 | 13 Jun | Open |
| RORyuki OnishiJP3 matches, 2019 | 1,477.8 | | | | 17 Feb 2019 | Open |
| KOKeita OnoJP324 matches, 2016 to 2026 | 1,849.4 | +0.0 | 83.75 | 21-6 | 16 Aug | Open |
| TOTakashi OnoJP30 matches, 2019 to 2024 | 1,335.0 | | | | 9 Jun 2024 | Open |
| GOGendensuren OnobatMN16 matches, 2025 to 2026 | 1,523.0 | | 64.96 | 3-5 | 17 May | Open |
| COCsongor OnodiHU3 matches, 2024 | 1,475.1 | | | | 12 Oct 2024 | Open |
| AOAltansukh OnortsogtMN10 matches, 2026 | 1,566.5 | | 69.28 | 6-4 | 17 May | Open |
| AOAnika van Onselen5 matches, 2025 | 1,444.2 | | | | 7 Feb 2025 | Open |
| IOIsao OnumaJP1 matches, 2019 | 1,471.5 | | | | 17 Feb 2019 | Open |