article_snippet.sent: The greatest challenge to Rory McIlroy grand slam bid or Tiger Woods' latest comeback at this week's Masters could come from Mother Nature.
article_snippet.sent: Rory McIlroy hides under an umbrella as the heaven's open during practice on Tuesday .
article_snippet.sent: Dark clouds gather over the course as England's Lee Westwood practices his putting .
article_snippet.sent: Rory McIlroy's caddie J.P. Fitzgerald holds an umbrella over the player's head to let McIlroy's caddie J.P. Fitzgerald take a putt .
article_snippet.sent: Despite using an umbrella to shield the player from the elements on Tuesday, Rory McIlroy could find Rory McIlroy facing record high temperatures on the first day of play - with the mercury expected to reach 90F, approaching the record 91F set in 2011.
article_snippet.sent: Water puddles on a seat with the Masters' logo with the start of the tournament only a day away .
highlights_snippet.sent: Golf's first major of the season, the Masters, tees off on Thursday April 9 .
  
highlights_snippet.sent: Rory McIlroy is bidding for a career grand slam while Tiger Woods is back .
  
highlights_snippet.sent: CLICK HERE for all the latest news from The Masters 2015 .