Preheat oven to 500 degrees
Roll out the pizza dough on a lightly floured surface until it is roughly 12 inches wide and 1/4-inch thick. Place on a baking sheet (pizza pan if available) and sprinkle it liberally with cornmeal.
Brush the pizza dough all over with a 1/2 tablespoon olive oil then bake it until its golden brown and the crust is crisp around the edges, 10 to 12 minutes.
While the dough is baking, mince 1 clove of garlic and add it to a medium bowl along with the diced tomatoes, chopped basil, 1 tablespoon olive oil, and salt and pepper, to taste. Set the mixture aside.
Remove the pizza dough from the oven. Slice the tip off of the remaining garlic clove and immediately rub the cutoff end all over the hot pizza dough.