A woman walks past an Alibaba advertisement on a wall in Hangzhou, Zhejiang province, Sept 26, 2013.[Photo/Agencies]

Alibaba Group Holding Ltd has struck one of its largest deals with a US e-commerce company, agreeing to help Amazon.com rival ShopRunner expand into China.

ShopRunner, whose partners include Neiman Marcus and Nine West, will use Alibaba's domestic logistics infrastructure to launch in China later this year, ShopRunner Chief Strategy Officer Fiona Dias told Reuters on Wednesday. The move would offer a new way for US retailers to tap the world's second largest economy.

In October, Alibaba paid $202 million for a 39 percent stake in ShopRunner, which launched four years ago and sells products from thousands of brands like American Eagle Outfitters and Calvin Klein. The startup, with over a million members, is still a minnow compared with Amazon or eBay Inc, but a move into China could afford a major boost to its growth.

Alibaba and ShopRunner now aim to create a "joint brand" in China, Dias said. The venture will be in addition to Alibaba's other Web sites, including the three marketplaces that make up more than 80 percent of the e-commerce giant's revenue, according to the company's IPO filing on Tuesday.

Alibaba reports strong growth before IPO

Alibaba picks up digital content stake

US retailers from Best Buy to Wal-Mart have long tried to crack a Chinese retail market dominated by strong local players.

"Everyone would love to have a way to at least test the market," said Richard Last, a former JC Penney executive and now a professor of retail at the University of North Texas. "If you partner with the Alibaba group, you might have a good shot at being successful."

Alibaba, which on Tuesday filed for what could eventually become the world's largest technology debut, has been trying to court US retailers for years. Its Tmall marketplace hosts an increasing number of brands like Gap.

The company also has been investing in US technology startups, from ridesharing service Lyft to mobile messaging service Tango.

Dias said not all retailers have been comfortable selling through Alibaba sites because they are perceived to be cluttered with retailers who might be selling competing, counterfeit goods.

She argued that a partnership with Alibaba could make more goods available to Chinese buyers: while the appetite for American brands in China is large, the selection is narrow at present."They do want to access Chinese customers and they want to do it on their own terms," Dias said.

ShopRunner offers free two-day shipping within the United States from a variety of stores for $79 a year, similar to Amazon's "Prime" service.

Chinese consumers will get their products 10 days after ordering on the US website, Dias said. But they will have to pay shipping costs from the US market, which Dias said could wind up as high as 20 percent of the product price, or as much as $10 for a $50 item.

American Express, also an investor in Shoprunner, will offer some Alibaba customers complimentary memberships on ShopRunner. ShopRunner has a similar arrangement with American Express in the United States.

Alibaba confirms IPO in US	Alibaba investing in US messaging startup Tango