The Seahawks’ biggest challenge in their opening game of the 2018 season might not be Von Miller, who has put up double-digit sacks in each of his six healthy seasons. It might not be the Broncos’ new quarterback, Case Keenum. It might not be Denver’s secondary, or its receivers, or running game.



It might not be any player – or even any person – at all.



The Seahawks will open their season by stepping into a situation where almost no one comes out with a win: a September road game in Denver. Take a look at Denver’s win percentage by month (with credit to Justis Mosqueda for originally bringing this to my attention last season):



Since conference re-alignment in 2002 – when the Seahawks departed the AFC West – the Broncos have lost four times in 31 September home games, a win percentage of 87.1. In October through December, the Broncos have gone 55-36, good for about a 60 percent win rate. Going back even...