Rory McClaroy excluded speed in Canadian Open as he gave an one-over-market card in the first round.
Northern Irishmanman hit three Birds but four bogies in Ontario with 10 shots from Trail Club House leader Thorborne Olesen.
The nine-under-foot round of Dane Olesen included an eagle, eight birdies and a bogie.
Mcilroy completed Career Grand Slam to win all major Win in masters In April.
However, he produced a disappointing performance in the US PGA in May and his struggle continued at the Canadian Open as he prepares for the next week’s US Open.
In other places, Irishman Shane Lori gave Scotland champion Robert McIntire, and Danny Wilt of England to bring another shot back to end the first round to finish a promising 64 to finish a promising 64 to finish below six.