Going solely by your photos @libertyteeth, I compared the plant in question with those surrounding it. The plant in question appears to possibly have Leaf Roll. Notice the deep green leaves in the 1st image - the plant next to the bucket. I notice the plant in question is much lighter, meaning less nitrogen uptake (which is water dependent to be intake by the plant), or that the plant could have a disease or virus. If the flowers bloom and drop the blossoms, it could very well be Leaf Roll.

Another cause of tomato plant leaf curling, also known as leaf roll, is attributed to physiologic conditions. While its exact cause may be unknown, it’s believed to be a sort of self-defense mechanism. During excessively cool, moist conditions, leaves may roll upward and become leathery in an effort to repel this excessive moisture. This specific condition occurs around fruit setting time and is most commonly seen on staked and pruned plants.
Curling tomato leaves may also be triggered by just the opposite—uneven watering, high temperatures, and dry spells. Leaves will curl upward to conserve water but they do not take on the leathery-like appearance. Plum and paste varieties are most commonly affected.

There are things that mimic this, making it hard to identify via images. Pruning branches one node below a flower set can cause leaves to fold up and mimic leaf roll in some varieties.

Do you fertilize? What do you use if so? Pests and disease prefer weaker plants so healthy vigorous plants will be less prone to attack.