| 16‑Nov‑2020 | Orlando CH | Hard | R16 | 203 | 196 | (8)Mackenzie Mcdonald [USA] d. Ymer | 6-3 6-3 | | 0.65 | 0.0% | 4.1% | 67.3% | 48.5% | 50.0% | 5/9 | 1:32 |
| 16‑Nov‑2020 | Orlando CH | Hard | R32 | 203 | 280 | Ymer d. Chun Hsin Tseng [TPE] | 7-5 7-6(3) | | 1.22 | 1.3% | 4.0% | 61.3% | 58.7% | 72.4% | 1/4 | 2:04 |
| 9‑Nov‑2020 | Cary CH | Hard | R32 | 201 | 197 | Mitchell Krueger [USA] d. Ymer | 6-1 6-2 | | 0.52 | 2.6% | 7.7% | 64.1% | 52.0% | 28.6% | 1/5 | 1:12 |
| 19‑Oct‑2020 | Istanbul CH | Hard | R32 | 197 | 108 | (2)Jaume Munar [ESP] d. Ymer | 6-3 6-3 | | 0.83 | 3.6% | 3.6% | 52.7% | 51.7% | 46.2% | 1/6 | 1:32 |
| 28‑Sep‑2020 | Split CH | Clay | R32 | 188 | 267 | (PR)Maximilian Marterer [GER] d. Ymer | 6-2 6-2 | | 0.58 | 0.0% | 7.1% | 51.8% | 51.7% | 40.7% | 5/10 | 1:21 |
| 28‑Sep‑2020 | Roland Garros | Clay | Q2 | 188 | 168 | Sebastian Ofner [AUT] d. Ymer | 7-6(4) 7-6(5) | | 0.99 | 3.5% | 5.9% | 55.3% | 59.6% | 47.4% | 3/8 | 2:15 |
| 28‑Sep‑2020 | Roland Garros | Clay | Q1 | 188 | 112 | Ymer d. (3)Christopher Oconnell [AUS] | 7-5 6-4 | | 1.14 | 3.9% | 1.3% | 58.4% | 68.9% | 50.0% | 5/7 | 1:55 |
| 14‑Sep‑2020 | Rome Masters | Clay | Q1 | 185 | 86 | Mikhail Kukushkin [KAZ] d. Ymer | 6-7(3) 6-4 7-5 | | 1.10 | 8.7% | 1.0% | 57.3% | 72.9% | 43.2% | 4/11 | 3:01 |
| 7‑Sep‑2020 | Aix En Provence CH | Clay | R16 | 184 | 132 | Federico Gaio [ITA] d. (Q)Ymer | 6-4 6-4 | | 0.93 | 6.9% | 1.7% | 63.8% | 67.6% | 61.9% | 4/6 | 1:39 |
| 7‑Sep‑2020 | Aix En Provence CH | Clay | R32 | 184 | 213 | (Q)Ymer d. (LL)Ruben Bemelmans [BEL] | 6-4 2-6 6-4 | | 1.10 | 5.1% | 5.1% | 56.4% | 68.2% | 58.8% | 1/4 | 1:59 |
| 7‑Sep‑2020 | Aix En Provence CH | Clay | Q2 | 184 | 954 | (2)Ymer d. (WC)Arthur Cazaux [FRA] | 6-4 6-4 | | 1.49 | 1.9% | 0.0% | 54.7% | 82.8% | 58.3% | 1/2 | 1:31 |
| 7‑Sep‑2020 | Aix En Provence CH | Clay | Q1 | 184 | 233 | (2)Ymer d. (Alt)Marco Trungelliti [ARG] | 7-6(4) 6-1 | | 1.38 | 5.7% | 0.0% | 60.0% | 78.6% | 57.1% | 1/1 | 1:34 |
| 24‑Aug‑2020 | Prague CH | Clay | R32 | 187 | 158 | (8)Ernests Gulbis [LAT] d. Ymer | 6-2 2-6 6-4 | | 1.09 | 5.5% | 1.4% | 58.9% | 67.4% | 50.0% | 3/7 | 2:08 |
| 24‑Aug‑2020 | Prague CH | Clay | R64 | 187 | 192 | Ymer d. Maxime Janvier [FRA] | 6-3 7-6(4) | | 1.39 | 4.6% | 0.0% | 61.5% | 67.5% | 68.0% | 3/5 | 1:23 |
| 17‑Aug‑2020 | Prague CH | Clay | QF | 201 | 405 | (WC)Michael Vrbensky [CZE] d. Ymer | 6-2 3-6 6-4 | | 0.89 | 2.2% | 4.4% | 60.4% | 60.0% | 58.3% | 4/8 | 2:23 |
| 17‑Aug‑2020 | Prague CH | Clay | R16 | 201 | 256 | Ymer d. Tomas Machac [CZE] | 4-6 6-3 6-0 | | 1.30 | 10.8% | 0.0% | 59.5% | 63.6% | 60.0% | 2/5 | 2:16 |
| 17‑Aug‑2020 | Prague CH | Clay | R32 | 201 | 159 | Ymer d. (12)Martin Klizan [SVK] | 6-2 2-6 6-2 | | 1.27 | 5.9% | 1.5% | 58.8% | 62.5% | 67.9% | 3/6 | 1:51 |
| 17‑Aug‑2020 | Prague CH | Clay | R64 | 201 | 248 | Ymer d. Evgeny Karlovskiy [RUS] | 6-3 6-4 | | 1.26 | 3.8% | 5.1% | 51.9% | 68.3% | 44.7% | 3/6 | 1:34 |
| 9‑Mar‑2020 | Nur-Sultan CH | Hard | R16 | 206 | 154 | (3)Kimmer Coppejans [BEL] d. (14)Ymer | 7-6(4) 1-6 6-2 | | 1.06 | 7.1% | 0.0% | 58.3% | 65.3% | 48.6% | 4/9 | 2:08 |
| 9‑Mar‑2020 | Nur-Sultan CH | Hard | R32 | 206 | | (14)Ymer d. (Alt)Szymon Walkow [POL] | 6-1 7-6(7) | | 1.11 | 7.5% | 0.0% | 58.8% | 72.3% | 54.5% | 5/6 | 1:32 |
| 6‑Mar‑2020 | Davis Cup QLS R1: SWE vs CHI | Hard | RR | 202 | 173 | Alejandro Tabilo [CHI] d. Ymer | 6-4 6-3 | | 0.70 | 13.0% | 1.9% | 55.6% | 73.3% | 50.0% | 4/6 | 1:15 |
| 6‑Jan‑2020 | Bendigo CH | Hard | R64 | 173 | 167 | Danilo Petrovic [SRB] d. Ymer | 7-5 7-6(3) | | 0.80 | 5.1% | 6.4% | 65.4% | 66.7% | 48.1% | 1/4 | 1:33 |
