Preheat grill to medium heat, or between 350 degrees to 450 degrees F.
Trim excess fat from chicken, rinse and pat dry. If necessary, pound chicken to 1/2-inch thickness. Place chicken into a 1-gallon size resealable plastic bag. Add seasoning, oil and lemon juice to the bag. Seal bag and turn to thoroughly coat chicken.
Grill chicken over direct high heat for 6 to 8 minutes. Turn chicken and continue to cook for 6 to 8 minutes until cooked through. Transfer to a serving plate.
Combine salsa ingredients in a bowl; stir and season to taste with salt and pepper. (Can be made up to 8 hours ahead and refrigerated until ready to serve.)
Top grilled chicken with mango salsa and serve immediately.