U.S. stock index futures were lower Wednesday, pressured by some weaker-than-expected earnings and amid worries over global growth.
Asian stocks reversed earlier losses on Friday led by a 2 percent rally in Shanghai as investors cheered news that the yuan's trading band may be widened, which offset bearish sentiment triggered by weak U.S economic data.
China stocks led losses in Asian markets on Tuesday, after a preliminary survey of factory managers showed factory activity slowing in April, renewing fears of a slowdown in the world's second largest economy.
European shares were flat on Friday as talks over the "fiscal cliff" stalled.