Help for a sad tree

Can you please help identify this tree? It was planted 3 years ago, and this is the first time it's looked so bad. The leaves are barely growing.

The last picture is a closeup from a tree across the street-- I think it's the same type though I'm not completely sure.

I don't know why the first tree looks so bad because it's been mulched, and it gets the same amount of water as other trees in the area.

Thanks very much :)

 

Looks like Quercus phellos - Willow Oak.

 

The deformity of the leaves combined with the lush grass beneath makes me suspect lawn herbicides are the culprit.

 

Thanks very much Harry Homeowner and Ron B.

The first tree is located near the bottom of a hill. We added fertilizer to the lawn (which may have had weed control).

Do you think it would help to water the tree a lot or get some tree fertilizer?

Thank you! :)

 

I think it is pretty much a loss and should be replaced by a new specimen.