Black Spots on Foliage - Help Identifying?

[cruisin_psu]

Hi! I have something going wrong with one of my tomato plants! It is a purple cherokee grown in a 10gal fabric container. The soil is potting mix and I have been feeding with a mild fish/seaweed fertilizer. This guy gets full sun from the first hours of the day. I always avoid watering the foliage. He is the only plant exhibiting this issue of the 5 tomatoes.

I tried searching the Cornell site to identify what is going on with these leaves, but can't find a definitive answer. I'd love to hear some opinions of folks here!

[yashrg]

Could it be target spot?