Combine garlic, tomatoes, vinegar, oil, basil, black pepper, and salt in a food processor.

In a large resealable plastic bag, add chicken and marinade. Make sure chicken in well coated. Seal bag and allow to marinate for 6-8 hours in refrigerator.

Preheat grill. Place chicken on grill and cook on medium heat for 10-12 minutes, turning once. Remove chicken from heat and garnish with diced tomatoes or chopped basil.