Grilled Chicken with Nectarine, Red Onion, and Basil Relish

Heat grill to medium-high. Clean the grill and lightly oil. In a medium bowl, whisk together the white wine vinegar, 1/4 cup olive oil and 1/4 teaspoon each salt and pepper. Add the nectarines and red onion and toss to combine; set aside. Rub the chicken with the remaining 2 teaspoon oil, season with 1/2 teaspoon salt and 1/4 teaspoon pepper and grill until cooked through or an instant-read thermometer inserted into the thickest part of the breast registers 165 degrees F, 4 to 6 minutes per side. Fold the basil into the nectarine mixture and spoon over the chicken.