| ITF - M15 Pittsburgh | 07/13 21:30 | 25 | A.J Catanzariti v Christian Lakoseljac | 7-6,6-3 | |
| ITF - M15 Pittsburgh | 07/12 14:00 | 54 | Christian Lakoseljac v John Mercer | 6-3,6-2 | |
| ITF - M15 South Bend | 06/20 13:00 | 54 | Christian Lakoseljac v Adam Walton | 3-6,2-6 | |
| ITF - M25 Wichita | 06/16 16:40 | 26 | Felix Corwin v Christian Lakoseljac | 6-0,6-4 | |
| ITF - M25 Wichita | 06/15 17:10 | 25 | Christian Lakoseljac v Sekou Bangoura | 6-4,7-6 | |
| ITF - M15 Sunrise | 04/11 15:00 | 54 | Alex Knaff v Christian Lakoseljac | 6-4,5-7,10-6 | |
| ITF - M15 Poitiers | 03/14 13:45 | 44 | Pierre Delage v Christian Lakoseljac | 6-0,6-2 | |
| ITF - M15 Poitiers | 03/13 17:30 | 44 | Julien De Cuyper v Christian Lakoseljac | 7-6,4-6,8-10 | |
| ITF - M15 Creteil | 03/08 11:50 | 25 | Christian Lakoseljac v Theo Papamalamis | 4-6,3-6 | |
| ITF - M15 Creteil | 03/07 11:00 | 54 | Leo Doukhan v Christian Lakoseljac | 1-6,2-6 | |
| ITF - M15 Creteil | 03/06 08:30 | 54 | Alessio Basile v Christian Lakoseljac | 6-7,0-6 | |
| ITF - M15 Naples | 02/21 15:00 | 54 | Christian Lakoseljac v Blaise Bicknell | 5-7,2-6 | |
| ITF - M15 Cancun | 11/22 14:00 | 44 | Christian Lakoseljac v Andres Chavez | Retired | |
| ITF M25 Fayetteville | 11/02 14:00 | 54 | Chad Kissell v Christian Lakoseljac | Walkover | |
| ITF - M15 Tallahassee | 10/28 16:00 | 26 | Ryan Shane v Christian Lakoseljac | 6-2,6-4 | |
| ITF - M15 Tallahassee | 10/27 14:20 | 25 | Christian Lakoseljac v Dusty H. Boyer | 5-7,7-6,7-6 | |
| ITF - M15 Tallahassee | 10/26 13:00 | 54 | Christian Lakoseljac v Carles Hernandez | 7-6,6-3 | |
| ITF - M15 Tallahassee | 10/25 13:00 | 54 | Dhruv Sunish v Christian Lakoseljac | 6-7,3-6 | |
| ITF M25 Vero Beach | 10/19 16:00 | 54 | Reece Falck v Christian Lakoseljac | 6-4,6-4 | |
| ITF M25 Vero Beach | 10/18 16:00 | 54 | Matthew Foster-Estwick v Christian Lakoseljac | 4-6,6-7 | |
| ITF - M15 Naples | 10/13 18:30 | 25 | Christian Lakoseljac v Blu Baker | 4-6,3-6 | |
| ITF - M15 Naples | 10/12 13:30 | 62 | Rubin Statham v Christian Lakoseljac | 6-3,6-0 | |
| ITF - M15 Naples | 10/11 14:30 | 62 | Kyle Overmyer v Christian Lakoseljac | 4-6,0-6 | |
| ITF - M25 Champaign | 07/26 15:00 | 54 | Christian Lakoseljac v Cannon Kingsley | 2-6,2-6 | |
| ITF - M15 Champaign | 06/21 15:00 | 54 | Joshua Ortlip v Christian Lakoseljac | 6-3,6-4 | |
| ITF - M25 Wichita | 06/07 15:00 | 54 | Christian Lakoseljac v Nicholas Bybel | 5-7,5-7 | |
| ITF - M15 East Lansing | 11/20 22:10 | 25 | Michael Geerts v Christian Lakoseljac | 6-4,6-4 | |
| ITF - M15 East Lansing | 11/19 15:00 | 44 | David Fox v Christian Lakoseljac | 6-7,3-6 | |
| ITF - M15 East Lansing | 11/17 15:00 | 44 | Nils Ellefsen v Christian Lakoseljac | 6-7,4-6 | |
| ITF - M15 Norman | 07/11 16:40 | 26 | Christian Lakoseljac v Andrew Fenty | 1-6,6-2,6-7 |