By Stephen Eisenhammer RIO DE JANEIRO, Aug 12 (Reuters) - When China's Gong Jinjie and Zhong Tianshi won the women's team sprint to secure their country's first ever track cycling gold it was hard to see their faces under bright red helmets. It's the best feeling in my sport life," Benoit Vetu, who has coached the Chinese sprint team since 2013, told Reuters after the race. The Chinese broke the world record in qualifying and were too strong for Russians Anastasia Voinova and Daria Shmeleva in the final on the brand new Rio track. More...