1. Prepare grill.
2. Combine first 4 ingredients; set aside.
3. Sprinkle salt and pepper over both sides of fish; coat with cooking spray. Arrange fish in a grill basket coated with cooking spray.
4. Place on grill over medium-hot coals (350° to 400°); grill, covered, 5 to 6 minutes on each side or until fish flakes easily when tested with a fork. Top fish with tomato mixture.