Challenger - Aix en Provence 05/03 13:40 25 Thiago Monteiro v David Guez 6-1,6-3
Challenger - Sarasota 04/12 20:45 25 Gerald Melzer v Thiago Monteiro 6-2,1-6,6-4
Challenger Le Gosier 04/08 20:00 27 Thiago Monteiro v Malek Jaziri 2-6,6-4,5-7
Challenger Le Gosier 04/07 19:30 26 Thiago Monteiro v Omar Jasika 6-4,6-7,6-3
Challenger Le Gosier 04/05 23:20 25 John-Patrick Smith v Thiago Monteiro 7-6,5-7,6-7
Challenger Santiago 2 Qual 03/12 16:40 28 Rogerio Dutra Silva v Thiago Monteiro 6-3,6-7,6-3
Challenger Santiago 2 Qual 03/11 19:00 27 Thiago Monteiro v Juan Ignacio Londero 7-6,6-2
Challenger Santiago 2 Qual 03/09 21:15 26 Facundo Arguello v Thiago Monteiro 6-4,3-6,6-7
Challenger Santiago 2 Qual 03/08 15:00 25 Thiago Monteiro v Hans Podlipnik-Castillo 6-2,7-6
Challenger - Guayaquil 11/05 21:00 27 Thiago Monteiro v Guido Pella Retired
Challenger - Guayaquil 11/05 00:20 26 Roberto Carballes Baena v Thiago Monteiro 1-6,6-2,3-6
Challenger - Guayaquil 11/02 21:10 25 Axel Michon v Thiago Monteiro 4-6,0-6
Challenger Guayaquil Qual 11/01 15:30 44 Kamil Majchrzak v Thiago Monteiro 2-6,4-6
Challenger Campinas Qual 09/21 15:25 44 Tiago Lopes v Thiago Monteiro 3-6,6-4,6-3
ITF Georgia F2 05/30 07:00 - Grzegorz Panfil v Thiago Monteiro 7-5,6-3
ITF Georgia F2 05/29 12:00 - Thiago Monteiro v Pedro Sakamoto 6-4,7-6
ITF Georgia F2 05/27 07:00 - Thiago Monteiro v Pawel Cias 6-3,6-0
ITF Georgia F2 05/25 09:00 - Thiago Monteiro v Mousa Shanan Zayed 6-2,6-2
ITF Georgia F2 05/22 08:40 - Marco Bortolotti v Thiago Monteiro 6-7,7-6,6-2
ITF Georgia F2 05/20 05:00 - Thiago Monteiro v Alexander Igoshin Retired
ITF Georgia F2 05/19 06:00 - Thiago Monteiro v Michael Avetisyan 6-0,6-0
ATP Houston Qual 04/05 16:00 46 Yoshihito Nishioka v Thiago Monteiro 4-6,6-2,6-7
ATP Houston Qual 04/04 16:45 45 Thiago Monteiro v Ryan Harrison 4-6,7-6,6-2
ITF Dominican Republic F3 12/12 19:00 - Fabiano De Paula v Thiago Monteiro 6-7,6-0,6-3
ITF Dominican Republic F3 12/11 17:00 - Roberto Ortega-Olmedo v Thiago Monteiro 6-7,6-3,3-6
ITF Dominican Republic F3 12/10 19:00 - Corentin Moutet v Thiago Monteiro 4-6,3-6
ITF Dominican Republic F3 12/09 19:00 - Thiago Monteiro v Cristobal S-Corvalan 6-1,6-4
ITF Dominican Republic F2 12/05 17:10 - Thiago Monteiro v Fabiano De Paula 4-6,2-6
ITF Dominican Republic F2 12/04 16:00 - Thiago Monteiro v Corentin Moutet 6-3,6-2
ITF Dominican Republic F2 12/03 20:25 - Antal Van Der Duim v Thiago Monteiro Retired

Thiago Moura Monteiro (Brazilian Portuguese: [tʃiˈaɡu mõˈtejɾu]; born 31 May 1994) is a Brazilian professional tennis player.

Monteiro has a career-high ATP singles ranking of world No. 61 achieved on 17 October 2022. He also has a career-high ATP doubles ranking of No. 144, achieved on 31 January 2022. He is currently the No. 2 Brazilian tennis player.

On the ITF Junior Circuit, Monteiro peaked in the rankings at No. 2 on 2 February 2012, with his biggest junior singles title being the Grade A, Copa Gerdau in Porto Alegre, Brazil, in 2011.

In his first ATP match, as a wildcard ranked world No. 338 in the ATP 500 Rio de Janeiro in February 2016, Monteiro upset No. 9 Jo-Wilfried Tsonga in the first round. In the second round, Monteiro lost to eventual champion Pablo Cuevas. In his next tournament, the ATP 250 São Paulo, Monteiro won two matches (against former World No. 9 Nicolás Almagro, and Daniel Muñoz de la Nava), losing again to eventual champion Cuevas in the quarterfinals.

On May 8, 2016, Monteiro won his first ATP Challenger title in Aix-en-Provence, France. He defeated Carlos Berlocq in the final.