ATPTour.com revisits the storylines from the first quarter of the season The first quarter of the 2021 ATP Tour season was a history-make affair, with new and familiar faces grabbing headlines. Novak Djokovic set records at the Australian Open and atop the FedEx ATP Rankings. Daniil Medvedev made a rankings statement of his own and at the ATP Cup led Russia to glory alongside Andrey Rublev and former 'secret weapon' Aslan Karatsev, who came from obscurity to become one of the season's hottest players. NextGen ATP Finals champion Jannik Sinner, 19, surged to the cusp of the Top 20 after a ru...