Correct Option: A

The men’s defending champion, Roger Federer, won the US Open for a fifth consecutive time. In 2008, Federer won one Grand Slam singles title at the US Open over Briton Andy Murray. Federer was defeated by Nadal in two Grand Slam finals, at the French Open, and at Wimbledon, when he was going for six straight wins to break Bjorn Borg’s record.
Note : In 2016 Novak Djokovic was the defending champion, but lost in the final to Stan Wawrinka.