Under Armour CEO expects revenue to double by 2018

Under Armour forecasts $7.5B revenue 2018

Under Armour is expected to become a $7.5 billion company by 2018, a number that is on track to double this year's revenue, according to CEO Kevin Plank.

That growth from $3.1 billion in the most fiscal recent year, according to FactSet, will come, in part, from its international business, he said. Despite the economic slowdown in China, Plank told CNBC's "Power Lunch" he believes there is still an opportunity to expand to overseas markets, including Asia.

"We're building off our 2013 investor day goals. So we're actually a year early on reaching that 12 percent milestone with the company," he said in an interview from the athletic apparel company's investor day in Baltimore on Wednesday.

"And then, we're listing that we'll continue to grow our international business at a pretty large clip, so we'll be north of 15 percent will come from outside the United States by 2018."

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Plank said he was especially excited about sponsoring 2015 Masters winner Jordan Spieth and reigning NBA Most Valuable Player Stephen Curry, who are both helping to increase the brand's international recognition. On Under Armour's most recent Asian tour, the sportswear company released its Curry Two signature basketball shoes after its Curry One shoes did extremely well.

"You know Steph Curry is a great friend, he's a great partner to the brand, as well. He's someone we're going to have around for a very long time. And we're going to build a billion-dollar basketball business with Stephen Curry, so that will take market share from others," said Plank.

As for the possibility of a potential rivalry with Nike, which has already surpassed $30 billion in revenue for fiscal year 2015, Plank said he is not concerned. He said he does not look at the retail market for sportswear as a zero-sum game.

"We're incredibly bullish about the momentum of the brand, the athletes we have, the stable. Where we're headed. I think it's a great ambition for us, and I think our team can do it."