Novak clinched his record-extending eighth year-end no.1 finish when he defeated eighth seed Holger Rune 7-6, 6-7, 6-3 in his opening match at the Nitto ATP Finals.
Djokovic clinched historic seventh year-end no.1 finish as a crown to another exceptional season in which he won five titles.
Nole secured a year-end number one crown for a record-breaking seventh time with a 3-6, 6-0, 7-6 comeback win over Hubert Hurkacz in Paris semis. The top seed and five-time titlist will take on defending champion Daniil Medvedev (RUS, 2) in Sunday's final (15:00 CET).
Novak saved four match points in the second set and led 4-0 in the third set tie-break, but haven't made it into the Nitto ATP Finals championship match. Dominic Thiem clinched a 7-5, 6-7 (10), 7-6 (5) win in three hours. The Serbian star has enjoyed another exceptional season, capturing four titles, and has finished as world no.1 for the sixth time in the past 10 years.
Novak will receive the 2018 year-end ATP World Tour no.1 trophy this Sunday at The O2. He has also been selected by fellow players as the Comeback Player of the Year following his historic return from elbow surgery and a no.22 ATP Ranking in June to clinch year-end no. 1