With all the attention given to Clemsons offense and quarterback Deshaun Watson, it may be easy to overlook the contributions of the Tigers defense.But the play on that side of the ball could be a key factor as the second-ranked Tigers (9-0, 6-0 ACC) go into the seasons stretch run that starts with a visit from unranked Pittsburgh (5-4, 2-3) Saturday. Kickoff at Memorial Stadium in Clemson is at 3:30 p.m. ET with the telecast split between ABC and ESPN2.Clemson posted 565 yards in a 54-0 demolition of Syracuse last week, but the real story may have been the defenses second shutout of the season and the fifth since Brent Venables was named defensive coordinator in 2012.The Tigers held high-scoring Syracuse to 277 yards -- 208 below its season average -- and intercepted three passes, returning one 64 yards for a touchdown.It was a fun tape to study and grade, Clemson coach Dabo Swinney said. Its pretty special when you can play a clean game like that and