Apple (AAPL) stock update: U.S. stock futures slightly higher ahead of opening bell Tuesday

NEW YORK -- Corporate earnings are back in focus Tuesday.

BP kicked off the day with results that are likely to disappoint investors as the company paid out billions in fines to the U.S. government. UBS, meanwhile, posted a $2 billion loss driven by Libor fines.

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Disney and Zynga headline the list slated for the afternoon.

Some economic data is also on tap. At 10:00 a.m. ET, the Institute for Supply Management will release its monthly services sector index.

U.S. stock futures were slightly higher ahead of the opening bell Tuesday.

Fear & Greed Index

U.S. stocks sank Monday, with the Dow retreating from the 14,000 milestone as concerns about European politics -- namely, corruption allegations against the Spanish prime minister and a banking scandal in Italy -- weighed on the market.

Shares of Yum! Brands sank more than 5% in after-hours trading Monday after the restaurant operator said it expected earnings to fall in 2013 based on its recent struggles in China.

European markets were higher in morning trading, stabilising after Monday's slide. UK cable operator Virgin Media's shares were 13.7% higher after the company confirmed a possible bid from Liberty Global.

Asian markets ended mixed. The Shanghai Composite added 0.2%, while the Nikkei dropped 1.9% and the Hang Seng declined 2.3%.