Posted by ESPN.com's Bill Williamson
Random thoughts about San Diego's 17-6 win at Arizona:
The Chargers have to tighten up their issues on the offensive line. Star quarterback Philip Rivers was sacked four times in the first seven pass attempts. That is not good.
Rivers is a valuable commodity and he has to stay upright. That hasn't been a problem in the past for San Diego. Still, it's too early for the team to worry. It's the preseason and rookie guard Louis Vasquez was just getting his feet wet.
Despite all of the pressure on him, Rivers performed well. He completed 5 of 7 attempts for 116 yards.
The Chargers also had issues in kick coverage. They allowed two long returns early in the game. That issue can be worked on in camp. The Chargers can't continue to give up good field position. Oakland, which San Diego opens at Sept. 14, has one of the better return games in the NFL. So, the Chargers have three weeks to fix their special-teams issues.
Backup receiver Legedu Naanee continued to show his penchant for the big play. Sooner or later, this guy is going to be a consistent factor.
San Diego's pass defense, an issue most of last season, played solidly against the Cardinals.
The Chargers' run defense was also strong as it allowed just 3 yards per carry.
San Diego was penalized just three times, which is a good sign in the preseason.
Third-string quarterback Charlie Whitehurst continued to play decently.
Linebacker Kevin Burnett had five tackles, and he now has 11 in two limited preseason appearances.
Rookie safety Kevin Ellison took advantage of playing time and had five tackles. Ellison is making a push for extended action.