| ATP Madrid | 04/25 16:10 | 23 | [70] Alex Michelsen v Joao Fonseca [242] | 6-4,0-6,2-6 | |
| ATP Munich | 04/18 11:00 | 26 | [70] Alex Michelsen v Cristian Garin [106] | 7-6,2-6,1-6 | |
| ATP Munich | 04/15 12:30 | 25 | [473] Max Hans Rehberg v Alex Michelsen [70] | 6-7,3-6 | |
| ATP Monte Carlo | 04/06 10:35 | 14 | [99] Corentin Moutet v Alex Michelsen [70] | 6-1,6-3 | |
| ATP Houston | 04/02 19:10 | 25 | [70] Alex Michelsen v Max Purcell [79] | 5-7,7-6,4-6 | |
| ATP Miami | 03/23 18:00 | 24 | [26] Tallon Griekspoor v Alex Michelsen [73] | 7-6,6-7,6-4 | |
| ATP Miami | 03/21 00:35 | 23 | [73] Alex Michelsen v Lukas Klein [128] | 7-6,6-2 | |
| ATP Indian Wells | 03/10 02:00 | 24 | [17] Tommy Paul v Alex Michelsen [80] | 6-2,6-2 | |
| ATP Indian Wells | 03/07 23:20 | 23 | [80] Alex Michelsen v Jaume Munar [75] | 6-2,6-3 | |
| ATP Los Cabos | 02/22 23:25 | 27 | [75] Alex Michelsen v Jordan Thompson [42] | 6-0,6-7,5-7 | |
| ATP Los Cabos | 02/21 23:00 | 26 | [11] Alex De Minaur v Alex Michelsen [75] | 4-6,1-6 | |
| ATP Los Cabos | 02/19 23:00 | 25 | [104] Constant Lestienne v Alex Michelsen [75] | 3-6,6-7 | |
| ATP Delray Beach | 02/15 20:00 | 26 | [75] Alex Michelsen v Tommy Paul [14] | 7-5,4-6,6-7 | |
| ATP Delray Beach | 02/14 01:00 | 25 | [75] Alex Michelsen v Thanasi Kokkinakis [79] | 6-1,6-2 | |
| ATP Dallas | 02/09 01:00 | 26 | [14] Frances Tiafoe v Alex Michelsen [75] | 6-4,6-3 | |
| ATP Dallas | 02/06 18:00 | 25 | [281] Tennys Sandgren v Alex Michelsen [75] | 3-6,6-3,1-6 | |
| Australian Open | 01/20 10:55 | 25 | [6] Alexander Zverev v Alex Michelsen [91] | 6-2,7-6,6-2 | |
| Australian Open | 01/18 00:00 | 24 | [91] Alex Michelsen v Jiri Lehecka [23] | 4-6,6-3,6-4,6-4 | |
| Australian Open | 01/16 00:00 | 23 | [269] James McCabe v Alex Michelsen [91] | 6-7,6-3,1-6,2-6 | |
| ATP Auckland | 01/08 04:35 | 25 | [97] Alex Michelsen v Nuno Borges [66] | 6-0,6-7,3-6 | |
| ATP Auckland | 01/07 00:50 | 19 | Jack Loutit v Alex Michelsen | 3-6,3-6 | |
| ATP Auckland | 01/06 05:50 | 14 | [97] Alex Michelsen v Gregoire Barrere [84] | 6-2,6-2 | |
| ATP Brisbane | 01/03 01:00 | 25 | [97] Alex Michelsen v Ugo Humbert [20] | 4-6,4-6 | |
| ATP Brisbane | 12/31 04:20 | 19 | [97] Alex Michelsen v Diego Schwartzman [114] | 6-1,6-4 | |
| ATP Brisbane | 12/30 08:25 | 14 | [97] Alex Michelsen v Alessandro Giannessi [203] | 6-3,6-2 | |
| ATP Next Gen Finals | 11/30 17:00 | 3 | [70] Luca Van Assche v Alex Michelsen [97] | 4-3,3-4,3-4,4-1,4-3 | |
| ATP Next Gen Finals | 11/29 17:00 | 2 | [97] Alex Michelsen v Abdullah Shelbayh [185] | 2-4,4-1,0-4,0-4 | |
| ATP Next Gen Finals | 11/28 19:10 | 1 | [97] Alex Michelsen v Hamad Medjedovic [110] | 2-4,3-4,4-3,4-3,3-4 | |
| Challenger Champaign | 11/19 17:00 | 29 | [239] Patrick Kypson v Alex Michelsen [99] | 6-4,6-3 | |
| Challenger Champaign | 11/18 19:35 | 28 | [169] Titouan Droguet v Alex Michelsen [99] | 6-2,4-6,3-6 |