Challenger Costa do Sauipe 10/24 00:20 25 [172] Thiago Monteiro v Lottner/Siegemund [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] Nicolas Kicker v Thiago Monteiro [176] 6-3,2-6,3-6
Challenger Curitiba 10/13 14:45 25 Thiago Monteiro v Mantovana 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
ATP Bastad 07/15 10:35 25 [152] Thiago Monteiro v Nicolai Budkov Kjaer [298] 7-5,3-6,6-7
ATP Bastad 07/14 09:00 19 [140] Vilius Gaubas v Thiago Monteiro [142] 6-1,2-6,3-6
ATP Bastad 07/13 10:15 14 [301] Andrej Martin v Thiago Monteiro [142] 5-7,1-6
Challenger Braunschweig 07/08 09:50 25 [142] Thiago Monteiro v Christoph Negritu [282] 4-6,2-6
Challenger Modena 07/01 14:45 25 [300] Marco Cecchinato v Thiago Monteiro [142] 7-6,3-6,6-1
Wimbledon 06/23 11:40 14 [179] Yosuke Watanuki v Thiago Monteiro [143] Retired
French Open 05/25 13:15 23 [86] Vit Kopriva v Thiago Monteiro [131] 6-4,6-3,4-6,6-7,6-1
ATP Geneva 05/17 13:00 14 [106] Thiago Monteiro v Ivan Gakhov [317] 6-4,6-7,3-6
Challenger Oeiras 05/12 14:40 25 [106] Thiago Monteiro v Mitchell Krueger [151] 2-6,2-6
ATP Rome 05/05 16:00 14 [106] Thiago Monteiro v Federico Arnaboldi [194] 6-7,7-6,3-6
Challenger Mauthausen 04/28 14:10 25 [146] Shintaro Mochizuki v Thiago Monteiro [94] 6-3,6-3

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.