ATP Santiago 03/01 21:35 26 [91] Marco Cecchinato v Thiago Monteiro [84] 6-3,3-6,2-6
ATP Santiago 02/28 17:00 25 [84] Thiago Monteiro v Albert Ramos-Vinolas [50] 7-5,4-6,7-5
ATP Rio De Janeiro 02/23 00:00 26 [83] Thiago Monteiro v Cameron Norrie [13] 5-7,5-7
ATP Rio De Janeiro 02/20 22:00 25 [96] Dominic Thiem v Thiago Monteiro [83] 1-6,6-3,6-7
ATP Buenos Aires 02/13 20:05 25 [78] Thiago Monteiro v Aoxiong Wang [68] 6-7,4-6
ATP Cordoba 02/07 17:30 25 [67] Federico Coria v Thiago Monteiro [78] 6-7,6-1,6-2
Davis Cup 02/04 15:05 45 Thiago Monteiro v Rigele Te Cancelled
Davis Cup 02/03 16:40 45 Thiago Monteiro v Jie Cui 6-3,6-4
Australian Open 01/16 08:30 23 [77] Thiago Monteiro v Constant Lestienne [55] 3-6,6-7,3-6
ATP Auckland 01/10 03:55 25 [78] Jiri Lehecka v Thiago Monteiro [69] 6-3,7-5
ATP Auckland 01/08 01:35 19 [71] Thiago Monteiro v Ajeet Rai [466] 6-7,6-3,6-4
ATP Auckland 01/07 01:45 14 [71] Thiago Monteiro v Daniel Altmaier [94] 3-6,7-5,7-6
United Cup 01/01 00:00 - [71] Thiago Monteiro v Casper Ruud [3] 3-6,2-6
United Cup 12/30 00:00 - [16] Matteo Berrettini v Thiago Monteiro [71] 6-4,7-6
ATP Paris 10/30 10:00 19 [69] Quentin Halys v Thiago Monteiro [66] 6-3,7-5
ATP Paris 10/29 09:55 46 [118] Hugo Grenier v Thiago Monteiro [66] 6-4,2-6,6-7
ATP Vienna 10/25 12:00 25 [32] Grigor Dimitrov v Thiago Monteiro [66] 6-3,6-4
ATP Vienna 10/23 11:00 19 [54] Oscar Otte v Thiago Monteiro [61] 6-7,6-4,4-6
ATP Vienna 10/22 10:25 14 [81] Dusan Lajovic v Thiago Monteiro [61] 4-6,2-6
ATP Stockholm 10/17 16:00 25 [27] Holger N Rune v Thiago Monteiro [61] 7-5,6-2
ATP Gijon 10/12 15:50 26 [65] Thiago Monteiro v Pablo Carreno-Busta [15] 4-6,6-7
ATP Gijon 10/10 11:00 25 [67] Benjamin Bonzi v Thiago Monteiro [65] 4-6,5-7
ATP Tel Aviv 09/28 09:00 25 [62] Thiago Monteiro v Pablo Andujar [115] 6-7,1-6
Challenger Genova 09/25 15:30 29 [164] Nao Hibino v Thiago Monteiro [66] 1-6,6-7
Challenger Genova 09/25 09:00 28 [309] Luan Bruno v Thiago Monteiro [66] 2-6,4-6
Challenger Genova 09/23 12:25 27 [197] Sebastian Ofner v Thiago Monteiro [66] 7-6,4-6,6-7
Challenger Genova 09/21 17:30 26 [163] Dimitar Kuzmanov v Thiago Monteiro [66] 6-7,3-6
Challenger Genova 09/20 09:25 25 [193] Stefano Travaglia v Thiago Monteiro [66] 6-4,2-6,4-6
Davis Cup 09/17 15:45 4 [56] Joao Sousa v Thiago Monteiro [65] 6-3,6-1
Davis Cup 09/16 15:30 2 [93] Nuno Borges v Thiago Monteiro [65] 6-7,6-4,7-6

Thiago Moura Monteiro (Brazilian Portuguese: [tʃiˈaɡu mõˈtejɾu]; born 31 May 1994) is a Brazilian professional tennis player. He has a career-high ATP singles ranking of world No. 61, achieved on 17 October 2022 and a doubles ranking of No. 144, achieved on 31 January 2022. He is currently the No. 3 singles player from Brazil.

On the ITF Junior Circuit, Monteiro had a combined ranking of No. 2, attained on February 2012. His best junior singles result was the 2011 Copa Gerdau (Grade A) title in Porto Alegre, Brazil.