The Serb lost in the final of the Paris Masters to Karen Khachanov on Sunday but regained number one spot for the first time since October 31, 2016.
Meanwhile, Romania's Simona Halep continued to lead the Women's Tennis Association rankings released with 6,921 points, followed by Germany's Angelique Kerber.
Caroline Wozniacki of Denmark remained in her third place in this week's unchanged top 10, ahead of Ukraine's Elina Svitolina and Japan's Naomi Osaka, reports Efe.
The progression of the ATP ranking of Serbian tennis star Novak Djokovic, since October 31, 2016–AFP