 Germany: M25 Ueberlingen - Singles - Main |
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| Quarter-finals | Ollert L. | Santanna B. | 1:2 (6:4, 3:6, 3:6) | dettagli | 23.08.2019 |
| 1/8-finals | Boehler D. | Ollert L. | 0:0 RET. (5:6) | dettagli | 22.08.2019 |
| 1/16-finals | Ollert L. | Welte M. | 2:0 (6:3, 6:4) | dettagli | 21.08.2019 |
 United Kingdom: London - Roehampton - Singles - Main |
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| 1/16-finals | Ollert L. | Matusevich A. | 0:2 (4:6, 5:7) | dettagli | 18.09.2018 |
| United Kingdom: Nottingham - Singles - Main |
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| Quarter-finals | Ollert L. | Draper J. | 1:2 (6:2, 3:6, 4:6) | dettagli | 13.09.2018 |
| 1/8-finals | Ollert L. | Butler S. | 2:0 (6:2, 6:1) | dettagli | 12.09.2018 |
| 1/16-finals | Ollert L. | Gill F. | 2:0 (6:2, 6:0) | dettagli | 11.09.2018 |
 Italy: Sassuolo - Singles - Main |
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| 1/16-finals | Ollert L. | Turchetti N. | 1:2 (6:3, 1:6, 5:7) | dettagli | 20.06.2018 |
| United Kingdom: Barnstaple - Singles - Main |
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| 1/16-finals | Ollert L. | Carter R. | 1:2 (6:4, 64:7, 4:6) | dettagli | 26.09.2017 |
| Italy: Napoli - Singles - Main |
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| 1/8-finals | Ollert L. | Westerhof B. | 0:2 (5:7, 3:6) | dettagli | 11.05.2017 |
| 1/16-finals | Mertens Y. | Ollert L. | 1:2 (6:3, 4:6, 2:6) | dettagli | 10.05.2017 |
 USA: Vero Beach - Singles - Main |
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| 1/8-finals | Ollert L. | Rodriguez R. | 1:2 (6:4, 3:6, 4:6) | dettagli | 27.04.2017 |
| 1/16-finals | Ollert L. | Nakagawa N. | 2:0 (7:60, 6:3) | dettagli | 25.04.2017 |
| USA: Orange Park - Singles - Main |
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| 1/8-finals | Mantilla F. | Ollert L. | 2:0 (7:69, 6:2) | dettagli | 20.04.2017 |
| 1/16-finals | Ollert L. | Watanuki Y. | 2:0 (6:4, 7:62) | dettagli | 18.04.2017 |
| Germany: Kaarst - Singles - Main |
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| 1/8-finals | Ollert L. | Otte O. | 0:1 RET. (2:6, 0:0) | dettagli | 19.01.2017 |
| 1/16-finals | Ollert L. | Vliegen J. | 2:0 (7:5, 6:4) | dettagli | 17.01.2017 |
| Germany: Schwieberdingen - Singles - Main |
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| 1/16-finals | Otte O. | Ollert L. | 2:0 (6:2, 6:1) | dettagli | 10.01.2017 |
| USA: Tallahassee - Singles - Main |
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| Quarter-finals | Ollert L. | Spencer W. | 0:2 (3:6, 69:7) | dettagli | 09.12.2016 |
| 1/8-finals | Gosea F. | Ollert L. | 0:2 (65:7, 60:7) | dettagli | 08.12.2016 |
| 1/16-finals | Gracia J. E. | Ollert L. | 1:2 (6:2, 2:6, 3:6) | dettagli | 06.12.2016 |
| USA: Pensacola - Singles - Main |
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| 1/8-finals | Rybakov A. | Ollert L. | 2:0 (6:0, 6:1) | dettagli | 17.11.2016 |
| 1/16-finals | Riffice S. | Ollert L. | 0:2 (61:7, 5:7) | dettagli | 15.11.2016 |
| USA: Niceville - Singles - Main |
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| 1/8-finals | Chazal M. | Ollert L. | 2:0 (6:3, 6:3) | dettagli | 10.11.2016 |
| 1/16-finals | Crawford O. | Ollert L. | 0:2 (2:6, 2:6) | dettagli | 09.11.2016 |
| USA: Birmingham - Singles - Main |
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| Semi-finals | Ollert L. | Auger-Aliassime F. | 0:2 (62:7, 2:6) | dettagli | 05.11.2016 |
| Quarter-finals | Sigouin B. | Ollert L. | 1:2 (4:6, 6:2, 2:6) | dettagli | 04.11.2016 |
| 1/8-finals | Ollert L. | Cotrone D. | 2:1 (6:4, 4:6, 6:3) | dettagli | 03.11.2016 |
| 1/16-finals | Braun N. | Ollert L. | 1:2 (0:6, 6:4, 0:6) | dettagli | 01.11.2016 |
| Germany: Ismaning - Singles - Main |
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| 1/8-finals | Ollert L. | Molleker R. | 0:2 (3:6, 4:6) | dettagli | 20.10.2016 |
| 1/16-finals | Fabian P. | Ollert L. | 1:2 (7:5, 3:6, 3:6) | dettagli | 18.10.2016 |
| Germany: Oberhaching - Singles - Main |
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| 1/16-finals | Moeller M. | Ollert L. | 2:0 (6:0, 6:2) | dettagli | 11.10.2016 |
| Germany: Hambach - Singles - Main |
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| 1/8-finals | Ollert L. | Poljak D. | 0:2 (65:7, 3:6) | dettagli | 06.10.2016 |
| 1/16-finals | Guenther V. | Ollert L. | 0:2 (5:7, 3:6) | dettagli | 04.10.2016 |
 Austria: Telfs - Singles - Main |
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| 1/16-finals | Ollert L. | Picco F. | 0:2 (1:6, 1:6) | dettagli | 10.07.2012 |
| Germany: Leimen - Singles - Qualification |
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| Quarter-finals | Ollert L. | Otte O. | 0:2 (4:6, 1:6) | dettagli | 01.10.2011 |
| Germany: Kempten - Singles - Main |
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| 1/16-finals | Ollert L. | Zietsman J. | 0:2 (3:6, 2:6) | dettagli | 31.08.2011 |