Vinci, ranked 43rd, beat world number one Serena Williams, 2-6, 6-4, 6-4, ending the American's Grand Slam run at the US Open.
Earlier in the day, Pennetta, ranked 26, defeated world number two Simona Halep, 6-1, 6-3.
Although Pennetta, 33, and Vinci, 32, have both won Grand Slam titles in doubles, this is the first time they’ve reached a Grand Slam singles final.
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