Waring was tied for first place with Scott Jamieson after the second round and shot a 1-under 69.
While Jamieson (75) slipped down the leaderboard, Aiken caught up Waring after shooting 67 — despite three straight bogeys from No. 15. He bounced back by making birdie at the last.
Thorbjorn Olesen (67) and Marc Warren (66) are tied for third.
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