PORTLAND, Ore. (Friday, Sept. 1, 2023) – Christian Rasmussen continued to lay claim to the 2023 INDY NXT by Firestone championship, leading the opening practice Friday for the Grand Prix of Portland at Portland International Raceway. Rasmussen, from Denmark, led with a top lap of 1 minute, 2.8194 seconds in the No. 6 HMD Motorsports with…