Bring a large pot of salted water to a boil. Add spaghetti and cook until al dente, according to package directions.

While pasta is cooking, in a large bowl combine tomatoes, basil, olive oil, mozzarella, oregano, garlic, hot red pepper flakes, and salt and pepper to taste. This sauce can be made 4-8 hours in advance, leaving out the mozzarella. Let stand at room temperature.

Drain spaghetti. Add pasta to tomato mixture. If making sauce in advance be sure to add the mozzarella with the spaghetti. Toss to combine. Sprinkle with basil and serve immediately.