Second half goals from Paulinho and substitute Philippe Coutinho saved Brazil's blushes after a poor first half and gave them a deserved 2-0 win over Ecuador in Thursday's World Cup qualifier in Porto Alegre. With 23 minutes gone in the second period, Paulinho found himself unmarked at a corner and he had enough time to bring the ball down and hammer it into the roof of the net from eight metres out. Coutinho, who had replaced Renato Augusto a few moments earlier, grabbed a fine second after 75 minutes when he darted forward and exchanged passes with Gabriel Jesus before firing home from close range. The result means that Brazil, who became the first South American side to qualify for Russia earlier this year, sit atop the group with 36 points after 15 games, 11 points clear of second-placed Colombia. "It was another important result, the run we're on is very good," winger Willian said after the game. "The first half was difficult, we couldn't find space but in the second half we got the ball moving faster and found the way to goal." The win was coach Tite's ninth consecutive victory in competitive matches since he took over as coach in June last year. His revamped side have scored 26 goals and conceded only two in the process. Opponents Ecuador, meanwhile, have stumbled badly after winning all four of their opening qualifiers. The Andean side have picked up maximum points in only two of the 11 since, and tonight's result means they fall to seventh place in the South American qualifying table. The top four teams qualify automatically for Russia 2018 and the fifth-placed side goes into a play-off against a rival from the Oceania confederation. Brazil have never lost a World Cup qualifier at home and they never looked in danger against their limited rivals. Neymar produced some flashes of individual brilliance but was not as influential as in the past, and it was the introduction of Coutinho 13 minutes into the second half that turned the game in favour of the home side. Argentina draw with Uruguay Uruguay and Argentina drew 0-0 in an uninspiring but hotly contested qualifier in Montevideo, a result that leaves both sides still needing points to guarantee a place at Russia 2018. The home side had the better of the first half and Argentina were on top during the second period but neither team posed much of a goal threat in a typically tense encounter. Uruguay's Diego Rodin had a goal chalked off for offside in the first half and Luis Suarez saw his 45-yard attempt to lob keeper Sergio Romero sail narrowly over. At the other end, Lucas Biglia had a 30-yard strike deflected just wide and Lionel Messi saw a shot turned around the post after a brilliant, jinking run and one-two with Paulo Dybala. Suarez, who recovered from a right knee injury just in time to play, limped off with eight minutes left. The result means Uruguay, who have now gone six games without a win, remain in third place with 24 points, while Argentina are fifth with 23 points, behind Chile on goal difference. (For more sports news and updates, follow Ahram Online Sports on Twitter at @AO_Sports and on Facebook at AhramOnlineSports.)