Trading in the U.S. index futures suggests that Wall Street stocks may open higher on Tuesday, extending the rally into session. Earnings news from tech giant IBM was received well by the markets, with the stock trading up in after hours. Oil is seeing some moderation after a strong rally in recent sessions and the dollar is firmer. The mood across the Atlantic remains positive despite the Greek risk, with strong quarterly results reported by some blue chips supporting sentiment. The domestic markets could also focus on another batch of earnings from companies, including United Technologies (UTX), Verizon (VZ), Travelers Companies (TRV) and DuPont (DD).