The undefeated Patriots first postseason game will be against the Jacksonville Jaguars.  The number-five seed earned the trip to Gillette Stadium for the divisional-round game by defeating the Pittsburgh Steelers 31-29 Saturday night.  Had the sixth-seeded Tennessee Titans upset the San Diego Chargers yesterday, they would have been the Patriots’ opponent.  But the Chargers won the wild card game 17-6.  The last time the Patriots played the Jaguars was December 24th, 2006 and they beat them 24-21 to win clinch the AFC East title.  Kickoff for Saturday night’s game in Foxboro is at 8 p.m.