The San Diego Chargers' defense and Special Teams may have just played their best half of football all season, and (of course) it came after the Chargers games mean anything this season. It has led to a 13-3 San Diego lead over the Pittsburgh Steelers, which is a lead that the Chargers could easily give away in the second half.
Philip Rivers hasn't been effective, but he hasn't turned the ball over (he's only been sacked once!) and he had a nice throw to Danario Alexander for the game's only touchdown. For San Diego to win, they'll probably need more of that mistake-free football and more dominance from the defense.
The key to the game has been stopping the Steelers' running game. Isaac Redman has rushed the ball twice for 0 yards. Jonathan Dwyer is averaging 2 yards per carry. Keep that up and the Chargers probably win the game.
It would make total sense for San Diego to finally win their first ever regular-season game in Pittsburgh with a lame-duck Head Coach, maybe a lame-duck General Manager (some are arguing that the defense is saving his job today) and with a victory actually being detrimental to the future of the organization (a lower draft pick).