Question not an argument. Has Brad Ever taken a player outside of the top twenty and made them better. Brad has always been the beneficiary of someone's hard years of work which is not his fault? Coco needs someone who can break down every aspect of her game to an certain extent. Coco is a very smart lady who has to realized that fh extreme semi western grip is not low bouncing balls or off speed balls. I think someone like Hingis could give her the confidence to use the talent that she has and learn to move her foot better. I am not talking about foot speed but " the ability to put foot to ball".. e.g Iga, Rafa, Novak and Roger or Graf was the best I seen at that. Serena could fix her service with a week of intense bootcamp service drills. E.g my tennis coach would put me through some very intense drills on stroke ball hitting until I was about to loose my "lunch" and then when I was ready to walk of the court he would say " now give me 100 serves in the row off the wall without taking a break. " This drill put an heavy emphasis on perfect service motion and follow through while be pretty close to empty in the fuel tank. Later whenever I would get into long service game e.g. 8 or mor deuce, I had the confidence that I could clear the net and always produce a well placed serve regardless. I hope this makes sense.