Murs has now admitted that he never expected One Direction's US fans to be so accepting of his music.
He told MTV News: "It's brilliant. It wasn't hard. One Direction's fans, they literally found out I was supporting them, they went online, found out who I was, what songs I've done, my videos and then I walked out [at the] first gig in Detroit [and] everyone's just crazy.
"I was like, 'This is insane. They don't even know who I am. How could they be doing this?'"
Murs also said he hopes that supporting One Direction has helped him develop a new fanbase.
"You know, I'm hoping to convert more Directioners in my corner," he quipped. "And if I can have One Direction fans quoting me as well, that would be amazing. They seem to really like what I was doing. So yeah, it's positive."
Watch Olly Murs' 'Heart Skips a Beat' music video below: