Chinese e-tailer JD.com on Thursday relaunched its Paipai online marketplace, opening a new front in its escalating battle against the countrys e-commerce market leader Alibaba Group Holding. Paipais relaunch marks the first time that JD.com, the No.2 player by market share, has directly taken on Alibabas core e-commerce offering, Taobao. Paipai and Taobao both provide an online marketplaces for consumers and small businesses to sell goods to one another. Alibaba, which is preparing for a potentially record-breaking initial public offering (IPO) in New York this summer, said in its investor prospectus that gross merchandise volume on Taobao reached $48 billion during the March quarter.