Here's everything you must know before Tuesday's opening bell:

  1. Shares of Alphabet (GOOGL) rose premarket after it easily beat first-quarter earnings and revenue expectations.
  2. Amazon (AMZN) has begun work on a domestic robot nicknamed 'Vesta.' 
  3. United Airlines (UAL) CEO Oscar Munoz gave up his 2017 bonus. 
  4. Investors will analyze earnings from Coca-Cola (KO) , Verizon (VZ) and more. 
  5.  U.S. stock futures were higher despite rising bond yields.

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