Their first fight in 2004 ended in a draw and Pacquiao narrowly won the rematches in 2008 and 2011.

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And not just any old rematches, but extremely close contests.

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The most recent of 20 rematches between classic winners in the Belmont was two years ago, with Derby winner Animal Kingdom and Preakness winner Shackleford hooking up but 24-1 long shot Ruler On Ice pulled the upset.

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