| Challenger de Ostrava | 05/01 10:05 | 25 | [284] Steven Diez v Marcel Granollers [110] | 4-6,6-4,6-4 | |
| ATP Barcelona | 04/22 13:10 | 24 | [83] Nicolas Jarry v Marcel Granollers [107] | 7-5,4-6,6-4 | |
| ATP Barcelona | 04/21 10:45 | 64 | Nicolas Jarry v Marcel Granollers | 7-6,5-7,4-6 | |
| ATP Barcelona | 04/20 08:00 | 45 | [107] Marcel Granollers v Daniel Evans [89] | 6-3,4-6,7-5 | |
| ATP Houston | 04/12 20:35 | 27 | [95] Casper Ruud v Marcel Granollers [112] | 6-1,6-0 | |
| ATP Houston | 04/10 17:00 | 26 | [79] Bernard Tomic v Marcel Granollers [112] | 1-6,2-6 | |
| ATP Houston | 04/08 23:00 | 25 | [112] Marcel Granollers v Taylor Fritz [58] | 6-2,4-6,6-2 | |
| Challenger de Monterrey | 04/04 18:25 | 26 | [177] Marcos Giron v Marcel Granollers [111] | 4-6,6-3,6-4 | |
| Challenger de Monterrey | 04/02 20:10 | 25 | [246] Daniel Elahi Galan v Marcel Granollers [111] | 3-6,4-6 | |
| ATP Miami | 03/20 14:00 | 45 | [58] Reilly Opelka v Marcel Granollers [111] | 6-3,7-6 | |
| ATP Miami | 03/18 14:00 | 44 | Zane Khan v Marcel Granollers | 2-6,3-6 | |
| ATP Acapulco | 02/26 00:55 | 25 | [115] Marcel Granollers v John Millman [44] | 3-6,4-6 | |
| ATP Acapulco | 02/25 01:00 | 164 | [101] Guillermo Garcia-Lopez v Marcel Granollers [111] | 4-6,6-3,1-6 | |
| ATP Acapulco | 02/23 22:00 | 64 | [239] Kevin Krawietz v Marcel Granollers [111] | 5-7,4-6 | |
| ATP Delray Beach | 02/19 18:00 | 25 | [68] Jordan Thompson v Marcel Granollers [111] | 7-5,6-1 | |
| ATP Montpellier | 02/07 13:00 | 26 | [111] Marcel Granollers v Denis Shapovalov [25] | 4-6,6-7 | |
| ATP Montpellier | 02/04 15:00 | 25 | [111] Marcel Granollers v Ivo Karlovic [78] | 7-6,6-7,7-6 | |
| Challenger de Quimper | 01/29 11:25 | 25 | [109] Marcel Granollers v Pavel Kotov [319] | 6-4,4-6,3-6 | |
| Open de Australia | 01/15 05:25 | 23 | [108] Marcel Granollers v Marius Copil [60] | 3-6,4-6,4-6 | |
| Challenger de Da Nang | 01/12 04:30 | 29 | [110] Marcel Granollers v Matteo Viola [289] | 6-2,6-0 | |
| Challenger de Da Nang | 01/11 08:20 | 28 | [110] Marcel Granollers v Denis Yevseyev [348] | Retired | |
| Challenger de Da Nang | 01/10 07:55 | 27 | [110] Marcel Granollers v Alen Avidzba [415] | 6-7,6-2,6-4 | |
| Challenger de Da Nang | 01/09 11:00 | 26 | [110] Marcel Granollers v Carlos Boluda-Purkiss [352] | 6-4,6-3 | |
| Challenger de Da Nang | 01/08 07:30 | 25 | [110] Marcel Granollers v Arthur Rinderknech [421] | 1-6,6-4,6-4 | |
| ATP Pune | 01/01 13:30 | 25 | [96] Marcel Granollers v Ramkumar Ramanathan [132] | 6-4,4-6,3-6 | |
| Challenger de Champaign | 11/14 19:55 | 26 | Marcel Granollers v Ryan Shane | 3-6,4-6 | |
| Challenger de Champaign | 11/12 18:00 | 25 | [94] Marcel Granollers v Alexander Ritschard [470] | 6-1,6-1 | |
| Challenger de Knoxville | 11/07 15:00 | 25 | [236] Tobias Kamke v Marcel Granollers [96] | 6-4,3-6,6-4 | |
| ATP Basilea | 10/20 13:40 | 64 | [95] Marcel Granollers v Mackenzie McDonald [84] | 2-6,4-6 | |
| ATP Amberes | 10/17 15:00 | 25 | [95] Marcel Granollers v Cameron Norrie [87] | 3-6,2-6 |