New Delhi: India's Sumit Nagal received a masterclass from Roger Federer after a first-set stunner. No wonder he is on cloud nine following an impressive Grand Slam debut where he stretched the legend to four sets in the opening round of US Open. Nagal won the first set 6-4 before Federer upped the ante, winning 4-6 6-1 6-2 6-4 against the 190th ranked Indian.

"It felt amazing, could not have asked for a better match up on my debut Slam and on one of the biggest tennis courts I guess," the 22-year-old Nagal told PTI from New York on Tuesday.