In September, Sousa joined Portugal's Davis Cup team to face Moldova in the &lt;a href="2013%20Davis%20Cup%20Europe/Africa%20Zone%20Group%20II%23Moldova%20vs.%20Portugal"&gt;semifinals of Europe/Africa Zone Group II&lt;/a&gt;. He won his first singles match over Maxim Dubarenco and the doubles match with Gastão Elias. He lost his second singles match to Radu Albot in an epic five-set duel which lasted nearly five hours. Portugal won 3–2 and was promoted to Group I in 2014. Following early-round wins over Paolo Lorenzi and Sergiy Stakhovsky at the St. Petersburg Open, Sousa beat former ATP top 20 player Dmitry Tursunov in the quarterfinals to advance to his first career ATP tour semifinal. He would lose there to Guillermo García-López.