There are only two scores that matter to the Ravens as they chase the sixth AFC playoff berth: their own, and the San Diego Chargers-Kansas City Chiefs result at Arrowhead Stadium. If the Ravens sweep the annual season series with the Browns, they'll win their 10th game of the season. However, that won't earn them a playoff berth unless the Chiefs beat the Chargers. And that's where the Ravens' playoff outlook could catch a significant snag. The Chiefs are playing without starting quarterback Alex Smith due to a lacerated spleen. Plus, Chiefs running back Jamaal Charles is questionable with ankle and hamstring injuries. Chargers quarterback Philip Rivers is on a roll, playing as if he won't be denied a shot at the postseason. Despite a bulging disc in his back that might require offseason surgery, Rivers practiced all week and is listed as probable. Rivers won't have running back Ryan Mathews on the field due to an ankle injury, has an injury-riddled offensive line and wide receiver Keenan Allen is doubtful with a broken collarbone. Neither team is healthy, but Rivers could make the difference. Because of the comeback victory Rivers engineered against the Ravens this month, the Chargers would qualify for the playoffs ahead of the Ravens due to a head-to-head tiebreaker. The Ravens' multiple injuries on defense, especially to top cornerback Jimmy Smith, have taken a heavy toll on their playoff chances. If the Chargers win, the Ravens will be playing for nothing more than pride and a desire to finish the season on a winning note. That scenario could very well unfold Sunday.