1. Preheat grill to medium-high heat.
2. Brush 1 1/2 teaspoons oil over cut sides of tomato; sprinkle evenly with 1/8 teaspoon salt and 1/8 teaspoon pepper. Place tomato, cut sides down, on grill rack coated with cooking spray. Cover and grill 8 minutes. Cool slightly; peel and chop tomato. Combine tomato, 1/8 teaspoon salt, 1/8 teaspoon pepper, 1 tablespoon oil, basil, and next 6 ingredients (through garlic); toss gently.
3. Brush fillets evenly with 1 tablespoon oil; sprinkle evenly with remaining 1/4 teaspoon salt and remaining 1/4 teaspoon pepper. Place fillets, flesh side down, on grill rack coated with cooking spray. Grill 5 minutes; turn and grill 3 minutes or until fish flakes when tested with a fork or until desired degree of doneness. Serve with tomato mixture.