Novak completed the 2016 season with a 65-9 W/L record and seven titles won, and finished year as no. 2 for the second time in his career.
Sunday's contest between Novak and Andy Murray will be the first occasion in history that the year-end no.1 ranking is on the line at the title-match of the season finale.
The defending champion kept up the pressure in the race for the year-end no.1 ranking with a convincing 6-1, 6-2 win over Belgian David Goffin on Thursday.
The world’s biggest indoor tournament begins on Sunday, November 13, at the O2 Arena in London.
In his 10th appearance at the Barclays ATP World Tour Finals, world no.1 will attempt to win a record-tying sixth title.