LaDainian Tomlinson was back at practice for the first time since spraining his right ankle during the season opener, an encouraging sign for a San Diego Chargers team that's struggled to run the ball. Tomlinson said Wednesday that he hopes he can play in Sunday night's game at Pittsburgh, where the Chargers haven't won since shocking the Steelers in the AFC championship game following the 1994 season. Tomlinson missed the last two games with the ankle injury, an absence that coincided with the Chargers struggling not only in the running game, but when they had the ball inside the opponent's 20. Also back at practice was rookie right guard Louis Vasquez, who hasn't played since spraining a knee in the season opener.