You know when something goes wrong at work and you just want to slam your laptop shut, walk out of the office and quit? Apparently, professional athletes know that feeling, too. Tennis star Sorana Cirstea lost 6-2, 6-3 to Alexandra Shubladze in the quarterfinals of the Hong Kong Open on Friday night and shocked the tennis world by retiring from the sport immediately after the match. Cirstea, 36, was the No.