Bates totaled 13 kills and 11 digs to register her third double-double of the young season, while Schwantz had 11 kills and 12 digs to record her first career double-double.
Duke (4-0) limited UNCW (2-2) to a .037 hitting percentage for the match, including a -.075 clip in the third set. Libero Nicole Elattrache (12), setter Sarah Nelson (10) and defensive specialist Kelli Kalinoski (10) joined Bates and Schwantz with 10-plus digs. At the net, freshman middle blocker Summer Brown led all players with seven blocks. Both Bates and sophomore rightside hitter Samantha Amos contributed four blocks.
The first set featured 21 ties and 11 lead changes before Duke prevailed, 29-27. The Blue Devils fought off four set points, utilizing kills from Schwantz and Bates to keep the frame even. Schwantz gave Duke a 28-27 lead with her fifth kill of the opening set and Nicole Elattrache sealed the victory with an ace.
Duke and UNCW split the first 10 points of the second set before the Blue Devils went on a 5-1 run. Duke maintained the lead the rest of the way to take the frame, 25-19.
A 6-0 Duke run in the third propelled the Blue Devils to a 14-8 lead. The Seahawks retaliated with a 8-1 stretch of their own to gain a 16-15 advantage. The UNCW lead was shortlived, evaporating after a 7-2 Duke rally keyed by three Bates' kills. Bates' fourth kill of the frame established match point and Duke received a block for the final point to complete the sweep.
The Blue Devils return to Cameron Indoor Stadium Friday at 7 p.m., to take on Northwestern in the fourth match of the 2017 Duke Invitational.