Andy Murray will have to play better if wants to win the US Open but he did enough to make the last 16 with a four-set victory over Italy's Paolo Lorenzi.
Murray might have hoped for a less demanding workout, with sterner tests to come, but the Scot had to battle in Arthur Ashe Stadium to beat an inspired Lorenzi 7-6 (7/4) 5-7 6-2 6-3.
He will now face Bulgaria's Grigor Dimitrov at Flushing Meadows for a place in the quarter-finals.
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