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Sims was the #2 broadcaster for NFL on Westwood One Sports's Sunday afternoon doubleheader before taking the permanent play-by-play position on "Sunday Night Football". He replaced Joel Meyers on the "Sunday Night Football" game in 2006. Sims worked "Sunday Night Football" games from 2006 to 2012. From 2013 to 2014, Sims returned to Sunday Afternoon NFL action while working with former NFL quarterback Mark Malone.