Flavia Pennetta And 5 Other Astonishing Grand Slam Champions

— -- Flavia Pennetta capped one of the most unlikely runs in women's tennis history on Saturday with a 7-6 (4), 6-2 win over Roberta Vinci to win the 2015 US Open, her first -- and apparently last -- Grand Slam title.

Here's a look at five other Grand Slam champions that few saw coming.

Jennifer Capriati, No. 12 seed, 2001 Australian Open