FILE PHOTO: Tennis - ATP World Tour Finals - The O2 Arena, London, Britain - November 18, 2017 USA's Jack Sock reacts during his semi final match against Bulgaria's Grigor Dimitrov REUTERS/Toby Melville
(Reuters) - Top seed Jack Sock was "served off the court" while John Isner and Milos Raonic also exited on a day of upsets at the Delray Beach Open in Florida on Wednesday.
Two months after clinching his first Masters 1000 title in Paris, Sock was in less stellar form, beaten 4-6 7-5 6-3 by fellow American Reilly Opelka 4-6 7-5 6-3 in the second round.
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