ESPN college football analyst Kirk Herbstreit has updated his personal rankings following the conclusion of the opening weekend of the 2018 season.The first weekend of the season wrapped up on Monday night, with Virginia Tech dominating Florida State at Doak Campbell Stadium in Tallahassee, Fla.Herbstreit’s new rankings don’t feature too many surprises. Alabama, of course, is No. 1 following its blowout win over Louisville.Here’s Herbstreit’s full top four:AlabamaClemsonOhio StateGeorgiaHe included his next two teams, too: 5. Oklahoma 6. AuburnAfter week 1 my Top 41-@AlabamaFTBL 2-@ClemsonFB 3-@OhioStateFB 4-@FootballUGANext 2@OU_Football @AuburnFootball— Kirk Herbstreit (@KirkHerbstreit) September 4, 2018Alabama and Clemson look like obvious College Football Playoff contenders right now, while Ohio State and Georgia looked really good in their season openers, too.Oklahoma and Auburn were two of the most-impressive teams in Week 1, also. The Sooners blew out Lane Kiffin’s FAU, while the Tigers secured the best win of the opening weekend, beating Washington.The official Coaches’ Poll and AP Poll top 25s are set to be released later today.