By Adam Jourdan SHANGHAI (Reuters) - China's Suning Commerce Group is leading a race to buy UK-based Stellar Group, one of the world's leading soccer agencies, a person with knowledge of the talks said, even as the retail giant is set to also invest in Italian club Inter Milan. Reuters reported last month that at least four Chinese investor groups, including model car maker Rastar, were interested in buying Stellar, which has masterminded some of soccer's biggest transfers including Wales international Gareth Bale's record 86 million pound ($126 million) move to Real Madrid. Other Chinese suitors for Stellar, which could fetch around 900 million yuan ($136.6 million), include property developer Evergrande Group and private investors, according to the person and documents reviewed by Reuters. More...