Challenger - Bangkok 01/09 04:25 25 Tsung-Hua Yang v Frederik Nielsen 4-6,3-6
Challenger Bangkok Qual 01/08 05:35 54 Frederik Nielsen v Lukas Ollert 5-7,7-5,6-4
Challenger Bangkok Qual 01/07 08:25 46 Frederik Nielsen v Matej Sabanov 5-7,6-4,6-4
Challenger Bangkok Qual 01/01 05:45 54 Frederik Nielsen v Flavio Cipolla 6-2,5-7,4-6
Challenger Bangkok Qual 12/31 06:15 46 Nino Serdarusic v Frederik Nielsen 4-6,6-7
Challenger Bangkok Qual 12/30 07:35 45 Daniiar Duldaev v Frederik Nielsen 2-6,6-4,3-6
ITF Thailand F11 12/09 03:30 29 [245] Frederik Nielsen v Renta Tokuda [487] 2-6,4-6
ITF Thailand F11 12/08 03:00 28 Frederik Nielsen v Cheong-Eui Kim 6-4,6-4
ITF Thailand F11 12/07 04:45 27 Martins Podzus v Frederik Nielsen 6-3,4-6,3-6
ITF Thailand F11 12/06 06:10 26 Frederik Nielsen v Zsombor Piros 7-5,4-6,6-2
ITF Thailand F11 12/05 03:30 25 Frederik Nielsen v Ryota Tanuma 7-6,7-5
ITF Thailand F10 12/01 04:30 28 [246] Frederik Nielsen v Jose Statham [301] 6-7,4-6
ITF Thailand F10 11/30 03:00 27 Daniiar Duldaev v Frederik Nielsen 3-6,6-4,4-6
ITF Thailand F10 11/29 04:35 26 [246] Frederik Nielsen v Yan Bai [450] 7-6,6-3
ITF Thailand F10 11/28 07:05 25 Vadym Ursu v Frederik Nielsen 2-6,1-6
Challenger - Knoxville 11/08 17:00 25 [249] Frederik Nielsen v Darian King [177] 4-6,6-7
Challenger Knoxville Qual 11/07 15:00 54 Frederik Nielsen v Aron Hiltzik 6-3,6-7,6-1
Challenger Knoxville Qual 11/06 16:40 46 Neil Pauffley v Frederik Nielsen 2-6,4-6
Challenger Knoxville Qual 11/05 20:00 45 Frederik Nielsen v Henry Craig 5-7,6-3,6-3
Challenger - Charlottesville 10/31 17:45 25 [118] Bjorn Fratangelo v Frederik Nielsen [253] 7-6,7-6
Challenger Charlottesville Qual 10/30 14:00 54 [366] Edward Corrie v Frederik Nielsen [253] 4-6,7-6,6-4
Challenger Charlottesville Qual 10/29 15:40 46 [247] Frederik Nielsen v Dennis Nevolo [461] 7-6,6-3
Challenger Charlottesville Qual 10/28 18:40 45 Jack Murray v Frederik Nielsen 3-6,6-2,3-6
Challenger Las Vegas Qual 10/16 18:00 54 [320] Jan Choinski v Frederik Nielsen [249] 6-4,6-2
Challenger Las Vegas Qual 10/15 18:00 46 Trevor A Johnson v Frederik Nielsen 7-6,2-6,3-6
Challenger Las Vegas Qual 10/14 17:30 45 Greg Jones v Frederik Nielsen 5-7,6-4,6-7
Challenger Fairfield Qual 10/08 19:30 46 [267] Frederik Nielsen v Sekou Bangoura [406] 6-7,3-6
Challenger Fairfield Qual 10/07 18:35 45 Eric Johnson v Frederik Nielsen 2-6,5-7
Challenger Stockton 10/03 20:25 25 [267] Frederik Nielsen v Tim Smyczek [205] 2-6,5-7
Challenger Stockton Qual 10/02 17:00 54 Sebastian Korda v Frederik Nielsen 5-7,1-6