No, there is no blight involved with that tomato, Tom.
But are you sure it is getting water? I assume you have a drip tape or soaker hose under your black plastic. It could be possible that it may be crimped or clogged up around that plant. I think I'd pull the plastic up a tiny bit and peer inside.
Other than that, maybe there could be soil that's washed away from the root system. (JUst thinking out loud.)
Lastly, the curled leaves are definitely an environmental factor, usually from overwatering, under watering, etc. Again, just take a peek and see if that might be the cause. The rest of your plants look fantastic though! Be proud!
Shoe
