Pennetta, at 33 the oldest first-time Grand Slam finalist in the Open era, on Saturday became the first Italian to win the US Open women's crown with an efficient 7-6 (4), 6-2 victory over compatriot and childhood friend Roberta Vinci.
Marathon man Kei Nishikori sweated out a 6-4 1-6 7-6(4) 6-3 win over world number one Novak Djokovic at a steamy US Open on Saturday to become the first Japanese man to reach a grand slam final.
Caroline Wozniacki advanced to the US Open final in dramatic fashion on Friday when China's Peng Shuai was forced to quit due to injury, putting the Dane one win away from winning an elusive grand slam title.
Peng Shuai is at the center of public attention after successive victories at the US Open, rekindling China's hopes of winning the women's singles title in the absence of Li Na.
Federer saved two match points en route to coming all the way back from a two-set deficit, edging the 20th-seeded Monfils 4-6, 3-6, 6-4, 7-5, 6-2 on Thursday night to reach the semifinals at Flushing Meadows for the first time since 2011.
Peng Shuai joins two-time Grand Slam winner Li Na and doubles star Zheng Jie as the only Chinese players to reach the semifinals of a Grand Slam tournament.
Through a pair of back-and-forth sets, Novak Djokovic and Andy Murray put on a display befitting a matchup of past US Open champions.
Kei Nishikori felt like he had jet lag.
Peng Shuai shot a group of fashion photos and wrote about tennis and her life for the Chinese version of one of the European and American best-selling fashion magazines for women's sports and health.
Kei Nishikori became the first man from Japan to reach the US Open semifinals in 96 years, outlasting third-seeded Stan Wawrinka of Switzerland 3-6, 7-5, 7-6 (7), 6-7 (5), 6-4 on Wednesday.
Quiet achiever finally emerging from Li Na's vast shadow
He is the French free spirit with a love of the Bronx, Beyonce and drinking Coke mid-match whose complicated relationship with tennis and himself has got New Yorkers eating out of his hands.
Martina Hingis is back in the doubles semifinals of a Grand Slam for the first time since the 2002 Australian Open as she and Flavia Pennetta reached the US Open last four in their first major as a team.