U.S. stocks opened the week mixed as investors focus on planned trade talks between the U.S. and China. : U.S. stocks moved sideways in early trading Monday on Wall Street after notching their third straight weekly win. Investors eased into trading ahead of a highly anticipated meeting between the U.S. and China's leaders later this week. The world's two largest economies have been embroiled in a trade war that has taken the market on a volatile roller-coaster ride this year and Wall Street is hoping for a deal.