So here's the deal. I've poured several thousand hours of my time practicing and at least $2K in instruction and equipment. No matter how hard I try or what I do, I can't seem to put everything together. Two months ago my serve was incredible and my groundstrokes sucked. Now I can't serve worth a crap and my groundies are well formed. I don't know what to do. I've tried going "back to the basics" and "letting it flow" but I just end up frustrated. I know I have the potential to put everything together but I just don't know how. I picked up the sport 5 years ago and to this day I'm embarrassed to admit that I haven't won a single 2/3 set match. I've won sets but never a match. At times I just want to give up and sell my sticks but I love the game too much Suggestions, please?