Stadium: Holbæk Sportsby Round: 45
| New York, USA | 2020/02/09 20:30 | Soeda, Go v Nielsen, Frederik | 6-1,6-2 |
| Challenger - Phoenix | 2019/03/13 18:40 | Nielsen, Frederik v Polansky, Peter | 6-7,3-6 |
| Challenger - Phoenix | 2019/03/11 17:00 | Nielsen, Frederik v Martin, Fabrice | 6-4,7-6 |
| Challenger Noumea | 2018/12/31 04:05 | Daniel Masur v Nielsen, Frederik | 6-1,5-7,6-4 |
| Challenger Fairfield | 2018/10/08 17:00 | King, Kevin v Nielsen, Frederik | 6-4,6-3 |
| Challenger Fairfield | 2018/10/07 18:15 | Thai-Son Kwiatkowski v Nielsen, Frederik | 7-6,3-6,5-7 |
| Challenger Fairfield | 2018/10/06 22:15 | Nielsen, Frederik v Ortega-Olmedo, Roberto | 6-2,6-2 |
| Challenger Stockton | 2018/09/29 23:05 | Alexander Ritschard v Nielsen, Frederik | 6-4,7-6 |
| Coupe Davis | 2020/03/06 16:50 | Holger Rune v Garcia, Ignacio | 4-6,6-3,6-0 |
| Coupe Davis | 2019/06/22 15:00 | Garcia, Ignacio v Ponte Suarez, Maykol | 6-2,6-3 |
| Coupe Davis | 2019/06/21 15:00 | Major, Philip Wilbert v Garcia, Ignacio | 0-6,3-6 |
| Coupe Davis | 2019/06/20 15:00 | Garcia, Ignacio v Joseph, Kyle | 6-0,6-2 |
| Coupe Davis | 2019/06/18 15:00 | Garcia, Ignacio v Del Olmo, Tomas | 6-1,6-0 |
| ITF USA F30 | 2018/11/03 16:00 | Peter Bertran v Garcia, Ignacio | 6-3,6-1 |
| Coupe Davis | 2018/02/04 20:45 | Patino, Luis v Garcia, Ignacio | 7-5,6-2 |
| Coupe Davis | 2018/02/03 19:00 | Manuel Sanchez v Garcia, Ignacio | 7-6,6-4 |