Argentina advanced to the quarter-finals of the Davis Cup on Monday, beating Brazil 3-2 after Federico Delbonis defeated Thomaz Bellucci 6-3, 3-6, 6-2, 7-5 in a match that took two days to complete. The match had been suspended because of darkness on Sunday with Delbonis leading 1-0. It started late after Leonardo Mayer needed six hours, 42 minutes to beat Joao Souza in the longest singles match ever played in the Davis Cup. Argentina's Leonardo Mayer celebrates his country's win by spraying sparkling win in Buenos Aires . Federico Delbonis beat Thomaz Bellucci to secure victory over Brazil and send Argentina to the quarter-finals . The 83rd-ranked Delbonis dropped the second set after play resumed on Monday but quickly rebounded to regain control. Argentina, who will next play Serbia, is returning to the World Group quarter-finals for the first time since 2013. Juan Martin del Potro embraces his team-mate Delbonis - and Argentina face Serbia in the next round . Delbonis hits a shot during his 6-3, 3-6, 6-2, 7-5 win over Bellucci at the Villa Martelli in Buenos Aires .
Federico Delbonis defeats Thomaz Bellucci to secure 3-2 win over Brazil . Leonardo Mayer took six hours, 42 minutes to beat Joao Souza . Their match was the longest singles match ever played in the Davis Cup . Argentina will play against Serbia in the next round .