Americans had a great Thursday in 2015 Miami Masters at Key Biscayne. Serena Williams and Bryan Brothers sailed through to the finals of women’s singles and men’s doubles and another American John Isner caused an upset by beating no.5 seed Japan's Kei Nishikori. For a place in the men’s singles final, Isner has to fight it out with no.1 seed Novak Djokovic, who overcame a slow start before coming through against David Ferrer in just under two hours. In the women’s final, Serena Williams