| Challenger - Múrcia | 04/08 12:10 | 24 | [226] Thomaz Bellucci v Joao Domingues [221] | 3-6,6-4,6-0 | |
| Challenger - Alicante | 04/02 10:00 | 24 | [225] Thomaz Bellucci v Kevin Krawietz [241] | 5-7,2-6 | |
| Challenger - Santiago | 03/09 17:00 | 28 | [232] Thomaz Bellucci v Hugo Dellien [87] | 4-6,0-6 | |
| Challenger - Santiago | 03/08 19:35 | 27 | [169] Alessandro Giannessi v Thomaz Bellucci [232] | 6-3,4-6,4-6 | |
| Challenger - Santiago | 03/07 22:00 | 26 | [232] Thomaz Bellucci v Rogerio Dutra Silva [152] | 6-2,6-2 | |
| Challenger - Santiago | 03/05 18:35 | 25 | [232] Thomaz Bellucci v Renzo Olivo [314] | 7-5,6-4 | |
| ATP - Rio de Janeiro | 02/16 19:55 | 64 | [213] Thomaz Bellucci v Casper Ruud [129] | 6-7,6-7 | |
| Challenger - Dallas | 02/07 20:10 | 26 | [98] Reilly Opelka v Thomaz Bellucci [221] | 6-4,6-4 | |
| Challenger - Dallas | 02/06 02:00 | 25 | [269] Thai-Son Kwiatkowski v Thomaz Bellucci [221] | 4-6,7-5,5-7 | |
| Challenger - Cleveland | 01/30 23:00 | 25 | [223] Thomaz Bellucci v Jared Hiltzik [357] | 6-4,4-6,1-6 | |
| Challenger - Newport Beach | 01/24 18:00 | 26 | [225] Thomaz Bellucci v Miomir Kecmanovic [125] | 2-6,6-1,2-6 | |
| Challenger - Newport Beach | 01/22 20:55 | 25 | [160] Dominik Koepfer v Thomaz Bellucci [225] | 4-6,4-6 | |
| Challenger - Newport Beach | 01/21 19:40 | 24 | [245] Gastao Elias v Thomaz Bellucci [225] | 5-7,4-6 | |
| Open da Austrália | 01/09 07:05 | 44 | [226] Thomaz Bellucci v Lukas Rosol [144] | 6-2,3-6,4-6 | |
| Challenger - Buenos Aires | 11/13 16:00 | 25 | [244] Thomaz Bellucci v Gianluigi Quinzi [150] | 4-6,6-4,3-6 | |
| Challenger - Montevideo | 11/05 17:00 | 25 | [205] Lorenzo Giustino v Thomaz Bellucci [247] | 6-3,6-3 | |
| Challenger - Guaiaquil | 10/31 20:00 | 26 | [253] Thomaz Bellucci v Guido Andreozzi [97] | 3-6,2-6 | |
| Challenger - Guaiaquil | 10/30 00:40 | 25 | [339] Emilio Gomez v Thomaz Bellucci [253] | 2-6,6-3,4-6 | |
| Challenger - Lima | 10/23 00:20 | 25 | [252] Thomaz Bellucci v Jose Hernandez-Fernandez [253] | 6-1,6-7,4-6 | |
| Challenger - Santo Domingo | 10/08 21:00 | 25 | [220] Nino Serdarusic v Thomaz Bellucci [255] | 7-6,6-4 | |
| Challenger - Campinas | 10/05 22:25 | 27 | [262] Thomaz Bellucci v Thiago Monteiro [115] | 6-2,2-6,1-6 | |
| Challenger - Campinas | 10/04 19:00 | 26 | [262] Thomaz Bellucci v Marcelo Tomas Barrios Vera [303] | 7-5,4-6,7-6 | |
| Challenger - Campinas | 10/01 23:50 | 25 | [118] Juan Ignacio Londero v Thomaz Bellucci [262] | 4-6,3-6 | |
| Challenger - Banja Luka | 09/13 13:30 | 26 | [259] Laurynas Grigelis v Thomaz Bellucci [274] | 2-6,7-6,6-3 | |
| Challenger - Banja Luka | 09/11 13:05 | 25 | [274] Thomaz Bellucci v Pedro Cachin [250] | 7-6,6-1 | |
| Challenger - Génova | 09/08 18:40 | 28 | [227] Dustin Brown v Thomaz Bellucci [311] | 6-3,7-6 | |
| Challenger - Génova | 09/07 17:15 | 27 | [158] Christian Garin v Thomaz Bellucci [311] | 6-7,4-6 | |
| Challenger - Génova | 09/06 09:00 | 26 | [311] Thomaz Bellucci v Martin Klizan [71] | Retired | |
| Challenger - Génova | 09/04 11:15 | 25 | [311] Thomaz Bellucci v Gian Marco Moroni [212] | 7-6,6-3 | |
| Challenger - Génova | 09/03 09:10 | 54 | [311] Thomaz Bellucci v Zsombor Piros [388] | 6-3,4-6,4-6 |