ATP Buenos Aires 02/10 20:10 14 [148] Juan Manuel Cerundolo v Thiago Monteiro [119] 6-4,4-6,2-6
Davis Cup 02/03 13:45 168 [160] Elias Ymer v Thiago Monteiro [119] 6-4,4-6,2-6
Davis Cup 02/02 16:00 168 [364] Karl Friberg v Thiago Monteiro [119] 3-6,6-7
Challenger Punta del Este 01/26 20:00 27 [180] Roman A Burruchaga v Thiago Monteiro [120] 6-3,5-7,7-6
Challenger Punta del Este 01/25 23:15 26 [241] Facundo Bagnis v Thiago Monteiro [120] 2-6,3-6
Challenger Punta del Este 01/24 00:30 25 [376] Federico Agustin Gomez v Thiago Monteiro [120] 1-6,4-6
Challenger Brasilia 11/21 20:30 25 Thiago Monteiro v Fernando Romboli Cancelled
Challenger Montevideo 11/19 22:00 29 [111] Facundo Diaz Acosta v Thiago Monteiro [131] Retired
Challenger Montevideo 11/19 01:15 28 [112] Viljandi Spordikool v Thiago Monteiro [131] 6-7,6-1,3-6
Challenger Montevideo 11/17 21:25 27 [131] Thiago Monteiro v Camilo Ugo Carabelli [144] 6-1,4-6,6-4
Challenger Montevideo 11/15 17:00 26 [256] Santiago Rodriguez Taverna v Thiago Monteiro [131] 5-7,3-6
Challenger Montevideo 11/14 15:00 25 [282] Murkel Dellien v Thiago Monteiro [131] 0-6,4-6
Challenger Santa Fe 10/20 18:35 28 [146] Mariano Navone v Thiago Monteiro [126] 7-5,6-4
Challenger Santa Fe 10/19 18:45 27 [163] Facundo Bagnis v Thiago Monteiro [126] 2-6,0-6
Challenger Santa Fe 10/18 18:00 26 [395] Carlos Taberner v Thiago Monteiro [126] 4-6,6-4,1-6
Challenger Santa Fe 10/17 22:00 25 [126] Thiago Monteiro v Juan Manuel Cerundolo [99] 6-3,2-6,7-6
Challenger Buenos Aires 10/10 18:00 25 [150] Thiago Monteiro v Jan Choinski [127] 3-6,6-1,3-6
Challenger Campinas 10/08 16:20 29 [177] Camilo Ugo Carabelli v Thiago Monteiro [150] 6-3,4-6,4-6
Challenger Campinas 10/08 13:00 28 [150] Thiago Monteiro v Luciano Darderi [166] 6-2,6-1
Challenger Campinas 10/06 20:45 27 [137] Hugo Dellien v Thiago Monteiro [150] 7-6,4-6,3-6
Challenger Campinas 10/05 21:20 26 [150] Thiago Monteiro v Facundo Diaz Acosta [106] 3-6,6-1,6-3
Challenger Campinas 10/03 23:00 25 [284] Gustavo Heide v Thiago Monteiro [153] Retired
Davis Cup 09/16 15:40 5 August Holmgren v Thiago Monteiro Cancelled
Davis Cup 09/15 14:00 1 [4] Holger Rune v Thiago Monteiro [116] 7-6,6-7,2-6
Challenger Genoa 09/09 18:00 28 [118] Thiago Monteiro v Fabio Fognini [146] 2-6,4-6
Challenger Genoa 09/08 16:00 27 [357] Chun Hsin Tseng v Thiago Monteiro [118] 2-6,1-6
Challenger Genoa 09/07 12:10 26 [452] Lorenzo Rottoli v Thiago Monteiro [118] 3-6,2-6
Challenger Genoa 09/05 09:55 25 [233] Stefano Travaglia v Thiago Monteiro [118] 2-6,6-1,4-6
Challenger Como 08/30 09:40 25 [185] Luciano Darderi v Thiago Monteiro [118] 6-3,6-2
US Open 08/22 22:30 14 [115] Thiago Monteiro v Giovanni M Perricard [241] 7-6,6-7,6-7

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.