After watching Sam Groth who basically has my body I decided to try to use my legs on my serve. Try to jump up as I hit the serve. This takes a lot of leg power to lean backwards and then jump up without using your arms at all for the jump. I couldn't do it before but after a month or so of wearing a 25 pound pack while using the elliptical (last few days up to 35 pounds) apparently I now can. But it seems to have made my elbow hurt. Or was it the racquet? It was the red handled 6.1 prostaff stretch that I hadn't used before. Bit lighter than the other. Had to use 4 layers of duct tape (other has only 2) to get it up to 14 ounces. And I was playing with NXT. Had a huge kick. Was going up over H. Yu's head. Best my serve has ever been. He couldn't handle it at all. I got up 4-0 and then my elbow started really bothering me. Had trouble lifting water bottle up to mouth.

...so at 6-3 I switched to other 6.1 stretch, this one with natural gut. And I changed my serve. Eventually still jumping but cocking my arm more before jumping and coming more straight through the ball instead of a motion that imparts more kick.

And elbow started feeling better. Good as new by end of second set. Although serve a lot less impressive. But will work on it. Definitely like getting my legs more involved. I get to the net better if nothing else. And expect my serve will improve.

Other issue is the 2 layers of duct tape versus 4. It was much better with 4. Too many variables. But think I have to continue experimenting with more than 2 layers.

Won 6-3, 6-3. Won last 6 games. One hand backhand just needs a lot of practice, which it doesn't get.