For the Chicken, mix juice, oil, garlic powder, cumin, smoked paprika and red pepper in small bowl until well blended. Place chicken in large resealable plastic bag or glass dish. Add marinade; turn to coat well. Refrigerate 30 minutes or longer for extra flavor.
Meanwhile, for the Salsa, mix all ingredients in medium bowl. Cover. Refrigerate until ready to serve. Remove chicken from marinade. Discard any remaining marinade.
Grill chicken over medium-high heat 6 to 8 minutes per side or until cooked through. (Or bake in preheated 400°F oven 15 to 20 minutes.) Serve chicken with Salsa Fresca.