Watching Nikolay Davydenko play the most miserable set I've ever seen a pro tennis player play against Djokovic in Cincinnati this week, it looks like the cagey Russian might think seriously about retiring. Davy had cruised past Dolgopolov and Florian Mayer in the first two rounds of Cincy--but both of those guys are suspect, too, sometimes playing like world-beaters and other times playing like fodder--but against Djoko he looked like a guy who should take some serving lessons. He retired after the first set, but it wasn't clear what was exactly wrong with Davy except as Jimmy Arias said, "He didn't want to embarrass himself any further."Besides Davy who's currently ranked No. 50, other players who might think of hanging up their racquets are for one, James Blake (the 32-year-old is No. 106, though he has beaten No. 39 Andujar and No. 43 Harrison in 2 of his last 4 events, he only has 3 wins on the year). The question is: are you embarrassing yourself when you used to be No. 4 and now you're No. 106 and basically can't win a match outside the U.S. hard court series? If so, maybe you should go.How about Michael Russell: the 34-year-old is one spot ahead of Blake in the rankings, but actually has a winning record on the year, 11-10. Still, his only three wins over top-40 players this year were against an ailing Mardy Fish in Houston, and Kevin Anderson and Donald Young, two players who are on major skids this year.Or how about Michael Llodra, since February, the 32-year-old Frenchman has won two matches and is ranked No. 86. Ouch. Did anyone say Igor Andreev? He not only lost his girlfriend, uber-sexy Maria Kirilenko, but the Russian is now No. 94 at 29 and besides a couple of nice showings at minor clay events, he is sliding fast. He lost to Bradley Klahn in Aptos last week. So there you have it. If you have any more to offer, I'm all eyes. I always like to see who is slipping and should get the hook. It's just the macabre in me. If you'd like to meet me at the Qualis next week at the US Open, the best days of the tennis year in my book, then I will be at the main scoreboard from 1 to 1:15 pm on Tuesday, the first day. Take a look at my pic here and come over and say hello, talk some tennis and maybe we'll go off as a Tennis-Prose.com motley crew and catch a match to dissect and chew over. Maybe there's a Mitchell Frank or a Tennys Sandgren to check out. Three Main Reasons USO Qualis Are the Bomb:1. They're free2. The crowds are 1/10 of main draw 3. You see players struggling for their careers and hungry