NEW YORK, Sept 1 (Reuters) - Russian Daniil Medvedev made quick work of second-round opponent Dominik Koepfer 6-4 6-1 6-2 on Wednesday, soaking up the cheers of the U.S. Open crowd to keep his bid for a maiden Grand Slam title alive. The world number two broke his German opponent"s serve to kick off the match but Koepfer levelled with a break in the seventh game, helped by one of two Medvedev double faults in the opening set. It was one of a rare few moments of vulnerability for the 25-year-old, who kicked into high gear in the second set, hitting 10 winners in a clinical performance with just five unforced errors. Medvedev, who went from villain to crowd favourite as the runner-up in 2019, won all but one of his first-serve points in the third set and struck five aces past Koepfer, closing out victory in one hour and 48 minutes. "I"m really happy to be through in less than two hours," Medvedev said. "I try to take every match as a new challenge - the more I win throughout my career... the better I will feel." The performance was encouraging for the Cincinnati semi-finalist, who picked up his fourth Masters 1000 title last month in Toronto. Medvedev faces Spain"s Pablo Andujar in the third round.