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

  1. IBM (IBM - Get Report) said revenue for the three months ended in March rose 5% to just more than  $19 billion.
  2. A preliminary examination of the blown jet engine of a Southwest Airlines (LUV - Get Report) reportedly showed evidence of 'metal fatigue.' 
  3. CSX (CSX - Get Report) reported a top-and bottom-line beat for the first quarter, driven by lower costs and restructuring expenses.
  4. The IRS is giving taxpayers an extra day to file due to major outages on its website yesterday.
  5. U.S. stock futures pointed modestly higher on a strong beginning to corporate earnings season. 

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