After his explosive 2013, in which he spent 100 weeks at No. 1, Djokovic looks poised to take up the mantle of Federer and Nadal and become the world’s biggest tennis superstar. Sponsors are figuring that out, so his endorsement deal portfolio is quickly catching up and includes Uniqlo, Head, Adidas, Seiko, Peugeot, Nutrition, Sante, and three more deals to be announced this month.