By Kevin Sweeney Counting down the 10 most intriguing matchups and the most in-demand tickets for Week 7’s Saturday slate, where three games between teams 5–0 or better will be played on the same day. Demand Rankings is Sports Illustrated’s weekly look at the games and sports events that are driving the most demand for tickets across sports, including college football, NFL, NBA, golf, tennis and more. Here’s this week’s list of the most sought-after seats in college football. What a week we have to look forward to in college football. For the first time in 29 years and just the second time eve…