From watching the Kozlov Frank match, a couple things crossed my mind. 1st off, I was surprised that Kozlov beat Frank, who was coming off 2 Futures titles, plus a final. At the end, Frank looked out of gas, while Kozlov looked just fine. Dont know if the fatigue was cumulative from all of the matches Frank has played recently.
Also, Frank is another one if these recent American players with a weak two hand backhand. Kozlov's backhand was clearly better, I'd say his forehand was better as well. In the 2nd and 3rd sets Kozlov was running around his backhand on the return and cracking winners.
Lastly, for the guys saying that if CA or Rubin went to UVa, they would play low on the team because of all the depth, I disagree.
Frank was injured early in the second set. Pretty sure it happened when Kozlov went behind him following a wide serve in the deuce court in the third game. May have even happened earlier, but Frank bent over at that point in pain. As for conditioning being the problem, nope. Frank is the energizer bunny. It was the injury which he eventually called a trainer for.