Black spots on maple leaves?

[Log hog]

I have seen this in the past, and was wondering what it might be? It is also dropping some of its leaves. I heard that it could be Petiole Borers, but I am not sure. Haven't had a chance to look at the leaves and stems. The leaves have black spots on them. As much as I read about the borers there was nothing about leaves with the black spots and having the Petiole borers at the same time. Thanks for the help.

 

[Elmore]

Possibly Tar Spot

Maybe Tar Spot

http://www.ppdl.purdue.edu/PPDL/expert/Tar_Spot_on_Maple.html

 

[Kneejerk Bombas]

The Petiole Borers are typically earlier than the two common Tar Spots we see here in WI, but there could be some overlap.
One's an insect, one's a fungus, both are interesting, but unimportant to the health of the tree.

 

[Rtom45]

Sounds like tar spot. It has become fairly common on Norway maples in our area. It doesn't seem to affect the health of the trees, but it is unsightly.