I know they're not bums, but Kudla was quite a bit ahead of the other two in terms of development and the gap seems to have been narrowed quite substantially. I know Sandgren is in good form though.
Well to be fair, Kudla got a head start in the pro while Kosakowski and Sandgren went to college for a couple of years. I'm not really that surprised to see him struggle against them b/c he can't over power them and both players have decent to good backhand (Kudla's strength) as well as good serve. His experience is what probably got him the wins.
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Alex's main problem seems to be his inability to get a lot of length on his shots. So many of his shots should allow Russell to dictate and hit winners (yet Russell's preferred response seems to be to net the shot).