Qatar fell to a 2-0 defeat against Ecuador from Enner Valencia’s brace on Sunday and with it became the first host nation to lose an opening match at a World Cup tournament. Striker Valencia had a third-minute effort disallowed for offside in the build-up but then converted a penalty in the 16th and headed the second in the 31st minute of a lopsided affair. Valencia is Ecuador’s only World Cup scorer as he also netted all of their three goals at the nation’s debut in 2014. Harmless Qatar face a big challenge to survive the first round, with their other Group A games Friday against African cham…