Vancouver | Jonathan David scored three goals and Canada won its first World Cup match while all but securing a spot in the knockout round with a 6-0 victory over Qatar on Thursday.

Qatar was reduced to nine players because of red cards in the chaotic match. Assim Madibo was handed a red early in the second half after a tackle on Ismael Kone, who was stretched off with a serious injury to his lower left leg. Homan Ahmed was sent off in the first half for a challenge on Tajon Buchanan.

Canada Prime Minister Mark Carney attended the match after missing the team's opener in Toronto last week because of the G7 summit in France. He sat with FIFA President Gianni Infantino.

Cyle Larin scored his second goal of the tournament on a rebound in the 16th minute. Qatar goalkeeper Mahmoud Abunada punched away David's volley but it fell to Larin, who pointed to his ears in celebration as the red-clad crowd roared.

David doubled the lead with a right-footed volley in the 29th, for his first goal in the run of play in more than a year.

Ahmed was sent off with a red card in the 33rd. The official initially pointed to the penalty spot, but after video review Canada was given a free kick just outside the box and the initial yellow card handed to Ahmed was changed to red.

Canada made it 3-0 in first-half stoppage time when David scored in a scramble in front of the net off a shot that caromed off the crossbar. Qatari players stood with their hands on their hips in frustration while Canada celebrated.

Canada's players surrounded Kone in concern when he suffered the scary-looking injury early in the second half, and Madibo was clearly distraught before he was ejected.

Nathan Saliba, who came in as a substitute for Kone, scored on a free kick in the 64th to make it 4-0. Mohamed Manai deflected a shot past his goalkeeper for an own goal in the 75th.

David completed the hat trick in stoppage time, joining Argentina's Lionel Messi as the only players with three goals in a match in this World Cup.

Canada captain Alphonso Davies was available after he missed the opener while recovering from a hamstring injury. Moise Bombito was also available after missing Canada's opening World Cup match, a 1-1 draw against Bosnia-Herzegovina on Friday in Toronto. Neither Davies or Bombito played.

Qatar scored a stoppage-time goal to earn a surprising 1-1 draw with Group B favorite Switzerland in its opener. The Persian Gulf country was still looking for its first World Cup win after losing all of its group matches four years ago as the host.

Switzerland defeated Bosnia-Herzegovina 4-1 earlier in the day in Group B. (AP)