Jan 8 (Reuters) - China"s Eileen Gu capped the FIS Freestyle Ski World Cup season with a perfect record in women"s halfpipe after a triumph at Mammoth Mountain in California on Saturday to capture the first crystal globe of her career. The 18-year-old reigning world champion, who was born in the United States but will represent China at next month"s Beijing Olympics where she is tipped to win gold, delivered a pair of solid runs and finished with a best of 97.50. Former halfpipe world champion Kelly Sildaru (92.50) of Estonia finished second while American Brita Sigourney (87.75) took the bronze medal. Gu will head to the Feb. 4-20 Beijing Olympics full of confidence as she is a perfect four-for-four in halfpipe World Cup action this season.