ATP Rio De Janeiro 02/17 22:30 25 [38] Joao Fonseca v Thiago Monteiro [208] 7-6,6-1
ATP Rio De Janeiro 02/15 19:00 19 [209] Thiago Monteiro v Dusan Lajovic [123] 2-6,6-3,6-3
ATP Rio De Janeiro 02/14 21:05 14 [101] Adolfo Daniel Vallejo v Thiago Monteiro [209] 4-6,1-6
ATP Buenos Aires 02/08 18:45 19 [149] Hugo Dellien v Thiago Monteiro [210] 6-1,6-3
ATP Buenos Aires 02/07 17:50 26 [264] Al Badaya v Thiago Monteiro [210] 4-6,0-6
Challenger Rosario 02/02 23:10 25 [354] Facundo Mena v Thiago Monteiro [210] 7-5,7-6
Challenger Concepcion 01/29 20:30 26 [196] Thiago Monteiro v Tomas Barrios Vera [107] 2-6,5-7
Challenger Concepcion 01/27 20:40 25 [196] Thiago Monteiro v Facundo Diaz Acosta [247] 6-4,6-4
Challenger Itajai 01/23 17:00 27 [196] Thiago Monteiro v Adolfo Daniel Vallejo [146] 2-6,6-4,3-6
Challenger Itajai 01/21 18:55 26 [196] Thiago Monteiro v Franco Agamenone [279] 6-2,6-4
Challenger Itajai 01/19 21:25 25 [196] Thiago Monteiro v Joao Eduardo Schiessl [492] 6-2,6-2
Challenger Costa do Sauipe 10/24 00:20 25 [172] Thiago Monteiro v Juan Carlos Prado Angelo [248] 6-7,1-6
Challenger Curitiba 10/16 21:30 26 [223] Gonzalo Bueno v Thiago Monteiro [176] 7-5,6-4
Challenger Curitiba 10/14 23:25 25 [295] Cprf-Mordoviya v Thiago Monteiro [176] 6-3,2-6,3-6
Challenger Curitiba 10/13 14:45 25 Thiago Monteiro v Juan Carlos Prado Angelo Cancelled
Challenger Braga 09/30 11:45 25 [177] Thiago Monteiro v Henri Squire [331] 7-6,3-6,4-6
Challenger Lisbon 09/25 16:20 26 [177] Thiago Monteiro v Ignacio Buse [116] 6-7,4-6
Challenger Lisbon 09/23 13:05 25 [275] Marco Cecchinato v Thiago Monteiro [170] 6-7,6-7
Challenger Bad Waltersdorf 09/18 08:00 26 [170] Thiago Monteiro v Roman A Burruchaga [146] 4-6,7-6,0-6
Challenger Bad Waltersdorf 09/15 13:00 25 [170] Thiago Monteiro v Daniel Merida [166] 6-3,6-1
Challenger Szczecin 09/09 09:00 25 [284] Pablo Llamas Ruiz v Thiago Monteiro [169] 6-4,6-3
Challenger Genoa 09/05 18:30 27 [34] Luciano Darderi v Thiago Monteiro [169] 7-5,6-2
Challenger Genoa 09/04 17:15 26 [432] Enrico Dalla Valle v Thiago Monteiro [169] 4-6,6-7
Challenger Genoa 09/02 16:30 25 [169] Thiago Monteiro v Francesco Passaro [120] 7-6,6-3
Challenger Como 08/30 09:30 27 [258] Duje Ajdukovic v Thiago Monteiro [169] 6-3,4-6,6-4
Challenger Como 08/27 08:00 26 [354] Andrej Martin v Thiago Monteiro [169] 3-6,4-6
Challenger Como 08/26 08:00 25 [284] Alexander Ritschard v Thiago Monteiro [169] Retired
US Open 08/18 21:25 14 [172] Murphy Cassone v Thiago Monteiro [170] 6-3,5-7,7-5
ATP Kitzbuhel 07/20 09:00 19 Thiago Monteiro v Facundo Bagnis 1-6,4-6
ATP Kitzbuhel 07/19 09:00 14 [152] Thiago Monteiro v Neil Oberleitner [417] 6-4,4-6,7-6

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.