1/2 cup chopped peeled mango  | 
                                                1/2 cup chopped green tomato  | 
                                                2 tablespoons finely chopped red onion  | 
                                                4 teaspoons chopped fresh cilantro  | 
                                                1 teaspoon fresh lemon juice  | 
                                                1/4 teaspoon black pepper  | 
                                                1/4 teaspoon chili powder  | 
                                                2 (6-ounce) tilapia fillets  | 
                                                cooking spray  | 
                                                1/2 teaspoon old bay seasoning  | 
                                                4 (8-inch) whole-wheat flour tortillas  | 
                                                1 cup mixed salad greens  |