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Hornacek was fired by the Suns on Jan. 31 after a 14-35 start. He spent three seasons in Phoenix and compiled a 101-112 record.
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In New York, he will replace Derek Fisher — who was fired by the Knicks almost a week after the Suns dumped Hornacek — and interim coach Kurt Rambis. The Knicks finished 32-50, missing the playoffs for the third season in a row.