At Challenger tournaments, Sousa won two singles titles out of three finals – Mersin and Tampere – and one doubles title at Fürth.
Sousa played his first doubles rubber against Israel, partnering with Gastão Elias in a loss against Andy Ram and Jonathan Erlich.
At the Rosmalen Grass Court Championships, Sousa became the first Portuguese player ever to reach the semifinal of an ATP tour level grass tournament.
He beat in succession Paolo Lorenzi, Mate Pavić and Thiemo de Bakker, In September, Sousa was selected to join Portugal Davis Cup team against Russia for the Europe/Africa's Group I Relegation Playoff.
During 2009, Sousa was twice called to the Portugal Davis Cup team, winning both singles dead rubbers he took part in – over Philippos Tsangaridis from Cyprus in March and Algeria's Sid-Ali Akkal in July.
He also entered main draw events at the Barcelona Open (lost to Frederico Gil in the 2nd round) and the Croatia Open (lost to Matthias Bachinger in the 1st round).
After an unimpressive junior career, Sousa turned professional in 2008 and won his first singles tournament in 2009.Sousa holds several Portuguese men's tennis records.In October 2013, he ranked 49th in the world after his victory at the Malaysian Open, becoming the first Portuguese player to break into the singles top 50.In November 2015, Sousa reached a career-high and Portuguese-best ranking of world João Sousa was born on 30 March 1989 in Guimarães, Portugal, to Armando Marinho de Sousa, a judge and amateur tennis player, and Adelaide Coelho Sousa, a bank clerk. At age seven, Sousa began playing tennis with his father at a local club.In 2001, he won the national under-12 singles title, beating future Davis Cup partner Gastão Elias in the semifinals, and was runner-up in doubles.During the North American hard court Masters swing in March, Sousa started the Indian Wells Masters with a win over Aleksandr Nedovyesov, followed with a second-round loss to 20th seed Ernests Gulbis.