Thiago Moura Monteiro (Brazilian Portuguese: [t?i'agu mõ'tej?u]; born 31 May 1994, in Fortaleza) is a Brazilian tennis player.
Monteiro has a career high ATP singles ranking of World No.
74 achieved on February 27, 2017.
He also has a career high ATP doubles ranking of 304 achieved on January 28, 2019.
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, coming as WC into the ATP 500 Rio de Janeiro in February 2016, being just the World No.
338, surprised everyone by beating No.
9 Jo-Wilfried Tsonga, in the first round.
In the second round, Monteiro lost to Pablo Cuevas, who defeated Rafael Nadal in the semi-final and Guido Pella in the final.
The next tournament, the ATP 250 São Paulo, Monteiro won two matches (against former World No.
9 Nicolas Almagro, and Daniel Muñoz de la Nava), losing again to Cuevas (who also won this tournament) in the quarter-finals.On May 8, 2016, Monteiro won his first ATP Challenger title in Aix-en-Provence, France.