David Ferrer takes on John Isner this morning.
D. Ferrer vs J. Isner | Australian Open
Men's Singles | Round 4 | 25.01.2016 | Melbourne
Completed
D. Ferrer (11)
6
6
7
J. Isner (10)
4
4
5
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Updated 25/01/2016 at 09:57 GMT
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Andy Roddick tweeted last week that Isner has a tougher serve even than his.