With 49ers running back LaMichael James spraining his knee in Thursday night's preseason finale, Kyle Williams probably will return to punt-return duties in the Sept. 8 season opener against the Packers.San Francisco 49ers wide receiver Kyle Williams (10) and Tampa Bay Buccaneers cornerback Aqib Talib (25) battle for pass in the third quarter at Monster Park in San Francisco, Calif., October 9, 2011.San Francisco 49ers wide receiver Kyle Williams (10) catches pass and runs 56 yards for a touchdown after St. Louis Rams cornerback Josh Gordy (38) misses tackle in the fourth quarter in a game at Candlestick Park in San Francisco, Calif., December 4, 2011.