Soon afterward, Vemić joined the world number one tennis team for Novak Djokovic. As part of the Djokovic team, Vemić coached alongside Djokovic's longtime coach Marian Vajda in US Open '11, '12; Australian Open '12, '13; French Open '12, '13; Wimbledon '12, '13. During that time, Djokovic won two grand slam titles at the Australian Open and one grand slam title at the US Open in Flushing Meadows, NY, as well as the 2012 ATP World Tour Finals in London. In 2016, Vemic coached Djokovic at the ATP Miami Open, where he won the Championship against Kei Nishikori 6–3, 6–3, and surpassed Roger Federer in career prize money earnings.