Shares in JD Sports have jumped 10% with the retailer expecting the US to be its bigger market after a 5.7% increase in like-for-like sales across the Atlantic.
Six years since opening its first store stateside, the sports brand retailer expects the US market to soon contribute almost half of its global sales.
The expansion in America has offset declining second quarter UK sales, which fell 0.8%. Like-for-like sales in Europe grew 3%.
Signs of a revival in the sportswear sector also lifted Frasers Group, which owns Sports Direct, shares by 2%.
Régis Schultz, CEO of JD Sports Fashion Plc, said: "I am pleased to report like-for-like sales growth of 2.4% and organic sales growth of 8.3% in the second quarter, demonstrating the strength and agility of our multi-brand model.
"In particular, we saw double-digit organic sales growth in North America and Europe, supported by the continued success of our JD store rollout programme.
"We completed the acquisition of Hibbett, Inc. just before the period end and we look forward to its contribution to the growth and development of our US business in the coming years.
"Based on our first-half trading, we remain on track to deliver profit within our full-year guidance."
FTSE 100
The UK's flagship share index, the FTSE 100, was up 18-points at 8,306 shortly after opening this morning.
Brent crude oil futures were up 0.03%, trading at $77.24 a barrel