Find below a list of players who have withdrawn from the 2012 US Open and subsequently, players have moved into their spots in the main draw.

Men’s Main Draw Withdrawals:

Gael Monfils (FRA)
Rafael Nadal (ESP)
Juan Ignacio Chela (ARG)
Juan Carlos Ferrero (ESP) 

Women’s Main Draw Withdrawals:

Elena Baltacha (GBR)
Petra Citkova (CZE)
Svetlana Kuznetsova (RUS)
Kaia Kanepi (EST)
Flavia Pennetta (ITA)
Vera Zvonareva (RUS)

Men’s players move into main draw due to withdrawals and wild cards:

Benjamin Becker (GER)
Robby Ginepri (USA)
Rajeev Ram (USA) 
Olivier Rochus (BEL) 
Adrian Ungur (ROU)

Women’s players move into main draw due to withrawals and wild cards:

Greta Arn (HUN)
Casey Dellacqua (AUS)
Sesil Karatantcheva (KAZ)
Johanna Larsson (SWE)
Garbine Muguruza (ESP)
Shuai Peng (CHN)