ROSEMONT—Like an orange swarm, No. 1 Syracuse seemed to be everywhere Sunday.Coach Jim Boeheim’s long-armed and deep team used its lockdown defense and balanced scoring to rout DePaul 87-68 for a 15-0 start.With 7-foot Fab Melo altering numerous shots and blocking six others, the Orange took control in the first half, built a 19-point lead and then coasted.Kris Joseph, scoreless in his previous game, a victory over Seton Hall to open Big East play, had 22 points Sunday night as the Orange (15-0, 2-0 Big East) got their fast break going and consistently drove for layups.C.J. Fair added 16 points, Dion Waiters had 13 and Melo scored 12.Syracuse opened 18-0 last season and the Orange’s best start under Boeheim was 19 straight wins to kick off 1999-2000.But no matter the opponent, they will have to contend with a team that loses little when it substitutes, one that shares the ball and plays a confining 2-3 defense.DePaul (9-4, 0-1) had its five-game winning streak snapped and dropped to 3-18 all-time facing No. 1-ranked teams. Cleveland Melvin led the Blue Demons with 23 points.Syracuse held DePaul to 30.8 shooting in the first half — 0 for 8 on 3-pointers — and blocked five shots, three by Melo. The Orange shot 65.5 percent and had a 19-9 rebounding edge in opening a 45-26 lead.Playing its first game since Dec. 21, DePaul chopped the lead to 16 midway through the second half but could never make a serious run. When Melo’s block led a runout and Syracuse pushed the lead to 85-57 with about 4 minutes left, some of the crowd at the Allstate Arena started to head for the exits.