Saad's first goal -- his first since 2011 -- came in the 21st minute when he received a pass from Seth Sinovic, settled the ball and put a volley into the net.
He scored again in the 51st minute on the rebound of a long shot by Graham Zusi.
Claudio Bieler added another goal in 63rd minute for Kansas City (9-5-6), which extended its unbeaten streak to five games and took over the lead in the East with 33 points.
Toronto fell to 2-9-7.
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