And the home side was nearly on the scoresheet inside of 10 minutes when a Bradley Wright-Phillips shot from close range was blocked and Tim Parker pushed his shot wide of the far post from the rebound.
And more than 3,000 miles away, in Harrison, New Jersey, trouble also erupted in the stands during the semi-finals of the CONCACAF Champions League.
Alarm bells were ringing for the MLS side when forward Jozy Altidore had to leave the pitch in the seventh minute with an injury.
Club America had a free kick right on the edge of the penalty area in the 84th minute, with goalkeeper Agustin Marchesín coming up to take the shot so his teammates to load up the box.
Toronto will face Chivas at home in the first leg on April 17, before travelling to Guadalajara on April 25.
In the end, a goalkeeping masterclass from Rodolfo Cota saw the Mexicans through, as Chivas progressed to their first continental final in the Champions League era thanks to Isaac Brizuela's effort in the first leg.
Manchester City's quarter-final defeat by Liverpool was not the only continental clash to be marred by crowd violence on Tuesday. Bono stepped up again in the 63rd minute, jumping to get a glove on the ball and tip a well-placed strike from Alejandro Díaz over the crossbar.
"We didn't sign up for this tournament to get to the final, we signed up to this tournament to try to win it", Toronto coach Greg Vanney said afterward in a press conference. America's William da Silva beat him to the ball but inadvertently played the ball directly into Jonathan Osorio's pass for the goal.
Bono charged forward to put his body on a cross in the 77th minute, getting to the ball before a hard-charging Club America forward. Club America scored via stoppage time penalty kick, with Andres Uribe converting the chance.
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