Ingredients     1 tablespoon chopped fresh oregano     1 tablespoon extravirgin olive oil     1 teaspoon chili powder     3/4 teaspoon ground cumin     1/2 teaspoon salt     3 garlic cloves, minced     4 (6-ounce) skinless, boneless chicken breast halves $     Cooking spray     2 cups (1/2-inch) cubed seeded watermelon $     1 cup (1/2-inch) cubed peeled ripe mango $     1/4 cup finely chopped red onion     2 tablespoons chopped fresh cilantro     2 tablespoons finely chopped seeded jalapeño pepper (about 1 small)     1 tablespoon fresh lime juice     1/2 teaspoon sugar     1/4 teaspoon salt Preparation     Combine first 6 ingredients in a large zip-top plastic bag. Add chicken to bag; seal. Marinate in refrigerator up to 4 hours, turning bag occasionally.     Prepare grill.     Place chicken on a grill rack coated with cooking spray. Grill 5 minutes on each side or until done. Combine watermelon and remaining ingredients. Serve watermelon mixture with chicken.