Jonathan Schoop homered for the Orioles, who extended their lead in the AL East to a season-high 9 1/2 games. Baltimore endured two rain delays totaling more two hours and withstood an eighth-inning grand slam by Jay Bruce to notch its seventh win in nine games.
Norris (12-8) allowed four hits, struck out seven and walked one. He was 0-3 with a 5.11 ERA in his previous seven starts against Cincinnati.
Bruce's third career slam, off Darren O'Day, got the Reds to 5-4.