I'd agree with that. Take a look at nearby trees for potential parent plants.
With the clear image of the foliage, one can see the little bristle tips on the leaf margins. That puts this seedling in the Red Oak group of Quercus sp. - as opposed to the White Oak group, where bristle tips are absent from the leaf margins.
In Toronto, there are probably a few representative species, but this looks most like Quercus rubra - Red Oak.