After winning his junior Australian Open title, Fernandes elected to play senior tournaments.
He lost in the first round of qualifying at the Prime Cup Aberto de São Paulo challenger and the Brasil Open in Costa do Sauípe and U.S. Men's Clay Court Championships in Houston, ATP 250 events.

He played several ITF Futures tennis tournaments in Brazil, reaching the semifinals at the Brazil F4, losing to Marcel Felder, 4–6, 6–4, 4–6, and the quarterfinals at the Brazil F7, losing to Leonardo Kirche, 2–6, 1–6.

To prepare for the junior Wimbledon Championships, Fernandes played at the UNICEF Open, losing in the first round of qualifying to Aisam-ul-Haq Qureshi, 1–6, 5–7.

Fernandes entered qualifying for the Beijing International Challenger, defeating Jia Li and Hsin-Han Lee to reach the main draw, where he won his first challenger match, defeating Kaden Hensel.
Despite losing 4–6, 4–6 to Andrey Kumantsov in the round of 16, Tiago earned 13 points toward his ATP ranking, moving him up 117 spots to a career high ranking of 645.

He received a wild card to play the Samarkand Challenger, drawing top seed Blaž Kavčič in the first round.

Fernandes plays most of his ITF Futures events in his home country of Brazil.
He matched his best ever Futures result at the Brazil F28, reaching the semifinals and losing a tight match against the top seed Andre Miele, 7–6, 5–7, 5–7.

He received a wild card in to the main draw in the 2010 Copa Petrobras São Paulo challenger, coming back from a set and a break deficit to defeat fellow Brazilian Augusto Meirelles to win 3–6, 7–5, 6–0, saving three match points.
He lost to Nicolas Devilder in the following round.
After winning his junior Australian Open title, Fernandes elected to play senior tournaments. He lost in the first round of qualifying at the Prime Cup Aberto de São Paulo challenger and the Brasil Open in Costa do Sauípe and U.S. Men's Clay Court Championships in Houston, ATP 250 events.
He played several ITF Futures tennis tournaments in Brazil, reaching the semifinals at the Brazil F4, losing to Marcel Felder, 4–6, 6–4, 4–6, and the quarterfinals at the Brazil F7, losing to Leonardo Kirche, 2–6, 1–6.
To prepare for the junior Wimbledon Championships, Fernandes played at the UNICEF Open, losing in the first round of qualifying to Aisam-ul-Haq Qureshi, 1–6, 5–7.
Fernandes entered qualifying for the Beijing International Challenger, defeating Jia Li and Hsin-Han Lee to reach the main draw, where he won his first challenger match, defeating Kaden Hensel. Despite losing 4–6, 4–6 to Andrey Kumantsov in the round of 16, Tiago earned 13 points toward his ATP ranking, moving him up 117 spots to a career high ranking of 645.
He received a wild card to play the Samarkand Challenger, drawing top seed Blaž Kavčič in the first round.
Fernandes plays most of his ITF Futures events in his home country of Brazil. He matched his best ever Futures result at the Brazil F28, reaching the semifinals and losing a tight match against the top seed Andre Miele, 7–6, 5–7, 5–7.
He received a wild card in to the main draw in the 2010 Copa Petrobras São Paulo challenger, coming back from a set and a break deficit to defeat fellow Brazilian Augusto Meirelles to win 3–6, 7–5, 6–0, saving three match points. He lost to Nicolas Devilder in the following round.
Tiago Fernandes