Jack, I'm with you with the Baird's Sandpiper but the duck is really hard: the common sense is saying "Green winged" (no idea where did you see "more blue" - I see green on my monitor). You may have in Canada vagrant Eurasian Teal. The main problem for me is that pretty white wing bar (!!! could be just overexposure of the highlights and it seems pretty much the case!!!): with the Green-winged it should have some at least pinkish colors if not reddish... Most probably you are right but it make sense to play with the highlights (depends on the degree of the overexposure and the dynamic range of your sensor) - if you see even slight pink I would suggest Green-winged (just because it's more probable for Canada, not because the Eurasian is totally forbidden to have some pink there but not red). In case of totally overexposed highlights you still will see white and the case is unsolvable
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Oh and I have no idea why the lesser and the median covers look so grayish-white on your photo? I'm not very interested in ducks (except the Thanksgiving when they are my favorites - much more flavor than the turkey
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