The 2008 European number one has made many short forays across the Atlantic but he has always wanted to give the circuit a prolonged try and this year has taken out PGA Tour membership for the first time.
"I joined the US Tour because it's something I wanted to do, rather than end my career by not becoming a member and then saying to myself, 'I wish I had at least played one full season in the States'," Karlsson told reporters in an interview.
"I got the chance to join having finished runner-up to Lee Westwood last year at the St Jude Classic in Memphis ... and I'm really looking forward to the challenge.”
"I played a good few tournaments there in 2007 but this year it will be a full 15-event schedule," added the world number 16 ahead of his Qatar Masters title defence this week.
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