Scot Andy Murray stayed at the top of the Association of Tennis Professionals (ATP) men's singles rankings released on Monday, with 11,540 points.
The 29-year-old led the rankings for the first time on November 7 and has kept the lead since.
Serbian Novak Djokovic came second with 9,825 points, followed by Swiss Stan Wawrinka.
Belgian David Goffin has climbed one place in the rankings to join the top 10 tennis players in the world.