The invention provides seed and plants of tomato line TRSXI13-0020. The invention thus relates to the plants, seeds, and tissue cultures of tomato line TRSXI13-0020 and to methods for producing a tomato plant produced by crossing such plants with themselves or with another tomato plant, such as a plant of another genotype. The invention further relates to seeds and plants produced by such crossing. The invention further relates to parts of such plants, including the fruit and gametes of such plants.