Black Caviar

Updated 12:33 PM ET, Mon February 20, 2012
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Five-year-old mare Black Caviar is now ranked as th second-best racehorse of all time after winning her 19th race in a row last weekend. Getty Images
American mare Zenyatta was the last horse to put together an undefeated streak of 19 races, with the 20th proving one too far. Getty Images
If Black Caviar heads to Dubai, her race 20th race could be her toughest yet. She could be pitted against Sheikh Mohammed's super colt Sepoy. Getty Images