Heat broiler or prepare grill.
Rub chicken breasts with olive oil, salt and pepper.
Broil or grill chicken 4 inches from heat, turning frequently, for 6 to 7 minutes per side or until no longer pink in center. Serve with Tomato-Pesto.
Combine pesto, orange juice, balsamic vinegar, salt, pepper and tomatoes, cored and diced, in small bowl; toss to mix well. Refrigerate covered, at least 1 hour.