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NORMAN, Okla. (AP) -- Oklahoma has given offensive coordinator Lincoln Riley a three-year contract extension.

The school's Board of Regents approved the extension Thursday, the longest in school history for an assistant. The 33-year-old's contract now runs through the 2019 season.

In 2015, Oklahoma ranked fourth nationally in scoring and seventh in total offense as the Sooners qualified for the College Football Playoff. Riley won the Broyles Award as the nation's top assistant coach.

Last season, the Sooners set an NCAA record for passing efficiency rating, led the nation in pass completion percentage and ranked second in total offense. His units have included three top-four finishes in the Heisman balloting.

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