World number one Djokovic needed four hours and 57 minutes yesterday to defeat Mikhail Kukushkin 6-7 (6/8), 7-6 (7/3), 4-6, 6-3, 6-2 to pull Serbia level at 2-2 with Kazakhstan in Belgrade.

Viktor Troicki then beat world number 200 Aleksandr Nedovyesov 6-2, 6-3, 6-4 to put 2010 champions Serbia into a July 15-17 quarter-final with defending champions Great Britain. Djokovic hit 19 aces and 37 winners but committed 94 unforced errors in his epic win over Kukushkin.
"This was one of the most difficult matches in my career both physically and mentally," said 28-year-old Djokovic, who again was feeling the effects of a shoulder twinge.

World number two Murray needed four hours 55 minutes in Birmingham to defeat Kei Nishikori 7-5, 7-6 (8/6), 3-6, 4-6, 6-3 in another epic duel as his side took an unbeatable 3-1 lead over Japan.
Murray had seemed set for a comfortable afternoon against sixth-ranked Nishikori by taking the first two sets against a player he had defeated five times in six previous encounters. But Nishikori battled and was even a break to the good in the deciding set before Murray stormed back for victory.

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