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Sydney Sweeney is receiving a heap of praise for her latest performance as former professional boxer Christy Martin ... and all the love is making her emotional!

Sydney was brought to tears Friday after she and the rest of the cast got a thunderous standing ovation at Toronto International Film Festival following a screening of her biopic, "Christy."

SS was clearly overcome by the moment ... and she told the festival crowd it was an honor to play the iconic sports figure, who joined her on stage. Getty

This is a really big deal ... 'cause SS is known for being a smoking hot sex symbol and the most marketable person in the industry right now ... the film is testing through the roof , and there is serious Oscar buzz beyond the pretty fa

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