The San Diego Chargers (6-4) will try to win two straight when they host the St. Louis Rams (4-6) at 4:05 p.m. ET at Qualcomm Stadium.

Here are three things we’ll be watching for on Sunday.

1. Can the Chargers contain Tre Mason? A rookie running back out of Auburn, Mason finished with a career-high 113 rushing yards on 29 carries in the Rams’ impressive win over the Denver Broncos last week. It’s the first time Mason ran for over 100 yards this season. At 5-foot-8 and 200 pounds, Mason is a physical, downhill runner who can move the pile and break tackles. So the Chargers have to get 11 men to the football in the run game. The Rams are 3-2 this season when they rush for over 100 yards.

2. Convert on third down: San Diego is 7-of-26 (27 percent) on third down offensively the last two games. Offensive coordinator Frank Reich and quarterback Philip Rivers have to do a better job of getting positive yards on first and second down in order to make converting on third downs more manageable. The Chargers also have to protect a dinged-up Rivers from an aggressive St. Louis pass rush. The Rams have totaled 18 sacks in the last five games. Rookie Chris Watt, likely making his first career start at center on Sunday, has to do a good job of communicating and picking up the different looks St. Louis defensive coordinator Gregg Williams will dial up.

3. Win the turnover battle: The Rams are 0-3 when they lose the turnover battle this season, and have a minus-3 turnover differential in 2014. San Diego has forced just one turnover in the last four games. Defensively, San Diego has to find a way to steal a possession or two from St. Louis. The Chargers also have to do a good job of protecting the football on offense. San Diego protected the football early in the year, but has seven turnovers in the last four games.