Nothing compares to experiencing the first round of March Madness in a Las Vegas sportsbook, but I would add the first NFL Sunday to any fan’s bucket list.With the growth of fantasy football and proliferation of player prop betting, the energy has intensified on every single play. My biggest takeaway from engulfing myself in a Vegas book for the umpteenth time was the cheering and screaming every time a player approached the end zone. Simply put, every play now seemingly has higher stakes and thus more engagement.Let’s recap this first Sunday, then glean some actionable information for Week 2 and beyond.Chargers’ survivor pool carnageSunday’s biggest domino was undoubtedly the Los Angeles Chargers laying a giant egg and losing as 9.5-point home favorites to the Arizona Cardinals — the largest Week 1 upset since 2018.This nuked numerous moneyline parlays and survivor pool entries, with the Chargers being the most popular pick on Yahoo (more than 32 percent). Most notably, the infamous Circa Survivor saw nearly one-third of its record 25,017 entries (at $1,000 each) bounced by the Bolts — and by the way, include me in the carnage. The eventual winner(s) of $25.017 million will look fondly on avoiding that early landmine.That’s a tough pill to swallow, considering the Jacksonville Jaguars (-8.5) were an easy pick as similar home favorites over the lowly Cleveland Browns, cruising to a 34-10 win. Cleveland looks like it could be the league’s worst team yet again.A decade ago, the Browns went 1-31 over a two-year stretch, including 7-24-1 against the spread (ATS), and all it took was one quarter of watching Deshaun Watson’s ineptitude for me to realize we could be in familiar territory.