Novak Djokovic answers late call to help Serbia to Davis Cup victory over Croatia . The Serbian tennis star was in the stands for his first match since suffering a back injury against Italy on November 29. Reigning champions Switzerland on brink after doubles loss against Belgium .
Novak Djokovic answers late call to help Serbia to Davis Cup victory over Croatia . France through to last 16 but Great Britain made to wait . Reigning champions Switzerland on brink after doubles loss against Belgium .