Looks like some black spot or early blight.
Bleach spray, copper, serenade, etc should stop the spread. Keep an eye on it, and if after a few sprays it hasn't changed it is most likely something else like Fusarium or a root issue. The yellow leaves without the spots could just be die off from heat stress, or a lack of nutrients/water or it could be a bigger issue like Fusarium.
The plant wouldn't happen to be a determinate variety would it? I'm not familiar with that variety.
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