Marc Miller laid down a late flyer to put the No. 37 Dome Motorsport Mercedes-AMG GT4 quickest in the first Pirelli GT4 America practice session of the weekend at Road America.

Bell, in the No. 11 Chevrolet Corvette Z06 GT3.R, reeled off a best time of 2:04.372 early in the 60-minute session to edge out the Pro class-leading No. 18 RS1 Porsche 911 GT3 R of Jan Heylen by ...