Triple US Open champion Kim Clijsters\'s career came to end on Wednesday when she slumped to a shock second-round defeat to British teenager Laura Robson. Clijsters, the former world number one and four-time Grand Slam title winner, lost 7-6 (7/4), 7-6 (7/5) to the 18-year-old world number 89 who goes on to face China\'s ninth seed Li Na for a place in the last 16.