The duck could be an American Wigeon x American Green-winged Teal hybrid, a
known hybrid form, based on the black rump pattern and the white lines on the face (between the
red and green areas).
However, the duck could also be an American Wigeon x Eurasian
Wigeon (Anas penelope) hybrid, another known hybrid form, based on the oversized eye stripe
(similar to some American x Eurasian hybrids), the dark breast, and size.
The unanimous consensus of the Nevada Birding
Community (4 people commented) is that this is an American
Wigeon x Green-winged Teal hybrid.
For someone who has looked at ducks for decades,
this proves that there is always something new and interesting under