The US Open begins Monday evening at the Flushing Meadows in New York.This is the fourth and final Grand Slam of the season, with the other three being Australian Open, French Open and Wimbledon.World number nine Marin Cilic is the defending champion in the Men's Singles, while world number one American Serena Williams is the holder of the Women's Singles title. If Serena wins this time around as well, she will become the first player to complete the calendar Grand Slam since Steffi Graf in 1988, and will also draw level with the German's Open era record of 22 major titles.World number three Russia's Maria Sharapova pulled out of the tournament on Sunday due to injury. She has not played since Wimbledon following a knee injury.Serena Williams, world number one Novak Djokovic, Rafael Nadal, Kei Nishikori and Marin Cilic are among the players who will play their first round matches on Monday.In Women's Doubles, Sania Mirza and Martina Hingis continue to be the top seeds and will look to continue their brilliant form following the victory at Wimbledon.Leander Paes and Rohan Bopanna, with their respective partners, will also be seen in action in the Doubles.