Former Australian Open boys champion Olivier Anderson has been charged with corruption.
Murray beat Almogro in the quarter-finals while Djokovic overcame close friend Stepanek.
Djokovic and Nadal have played each other on 49 occasions with the Serb leading 26-23.
Andy Murray was knighted as part of the New Year Honours list.
Murray is building up to 2017 by taking part in the MWTC in Abu Dhabi.
Nadal cut his 2016 season short a month early owing to wrist injury problems.
The big four – Roger Federer, Rafael Nadal, Novak Djokovic and Andy Murray – have dominated the ATP tour for more than a decade.
Djokovic has won 12 Grand Slam titles thus far in his career.
Federer cut short his 2016 season following his semi-final loss to Raonic at Wimbledon.
The 17-time grand slam champion attacks governing bodies for not taking doping seriously enough.
Nadal ended his 2016 season in October owing to wrist injury problems.
The 17-time grand slam champion did not consider ending career during recent injury lay-off.
Murray eclipsed Djokovic as the number one ranked men's singles player at the Paris Masters.
Moya played a big part in the rise of Milos Raonic on the world stage.
Becker believes that Murray will have his work cut out in 2017.
Nadal is currently playing at the Spanish National Championship in the doubles category.
Murray was recently voted as the UK's greatest sportsperson ever.
Federer last won a Grand Slam in 2012 while Nadal's last major triumph was in 2014.
Djokovic is likely to start with Marian Vajda as his head coach, according to a report.
Andy Murray eclipsed Novak Djokovic as the men's singles top ranked player at the Paris Masters in November.
Murray's achievement can be attributed to the return of his coach Ivan Lendl.
Djokovic split with Boris Becker after three-years together earlier this month.