Undoubtedly one of the biggest games in Texas high school football this season will go down on Friday in Dallas as No. 1 Duncanville and No. 6 DeSoto face off in a huge rivalry tilt. The two teams have been among the state’s best for over a decade. And this game is expected to be another epic battle. That will be the only top-25 matchup this week, but there are sure to be some other surprises on the slate. Below are the four biggest games to watch in the Lone Star State this weekend: The On3 Massey Ratings — which were officially used during the BCS era and have generated college high school s…