Li Na win puts coach Carlos Rodriguez through tortureNo matter how much work is done on the practice court, how much tactical input is given, how many motivational words are said, a tennis coach is simply powerless if their player self destructs in front of their eyes.That was the case at Wimbledon on Thursday as Carlos Rodriguez watched Chinese Li Na go walkabout in the second set before pulling herself together to beat Romanian Simona Halep 6 2 1 6 6 0 on a sun bathed Court Two.The sixth seed, China first grand slam champion when she triumphed at the French Open in 2011, eased through the opening set but after sitting idle in her seat while Halep received treatment to her back, she fell apart.