Federer has won both his singles matches so far this week, first beating Yuichi Sugita of Japan before dispatching Russia’s Karen Khachanov, both in straight sets.
A fall against Sugita earlier in the week forced him to retire from their match during the second set, but the American claims to have overcome the hip problem he picked up two days ago and is fit enough to face Federer.
Fabulous from Federer, popping a delicate volley to Sock's left as he runs right, before showing more skills at the net and slicing a forceful pass down for a winner.
However, he saves it with a classic serve out wide, his preferred pattern of play on those big points in the advantage court, and seals the game with his 10th ace of the match.
Federer was in an exceedingly good mood on Tuesday during his win over Khachanov and has already lauded the informal nature of the Hopman Cup, which is technically an exhibition tournament.
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