Combine first 7 ingredients. Stir in 1/8 teaspoon each of salt and pepper. Cover salsa, and chill at least 30 minutes.
Sprinkle fish fillets with remaining 1/8 teaspoon each salt and pepper. Place fillets on grill rack coated with cooking spray; grill 3 minutes on each side or until fish flakes easily when tested with a fork. Serve with salsa and lemon wedges.