Novak Djokovic rounded off a perfect Group Ivan Lendl campaign with a 6-1 6-2 win over ATP World Tour Finals injury replacement David Goffin.

The Serbian, assured of top spot before Thursday's match, turned in a solid if unremarkable display against his number-11 ranked opponent, who was standing in for the injured Gael Monfils.

Goffin failed to build on a relatively promising start and was beaten in little over an hour on his Finals debut.

Djokovic started with back-to-back double faults in a scrappy opening service game, which he nonetheless won.

But after Goffin held, he put pressure on the Djokovic serve, rallying from 40-0 to get to deuce when a precise forehand caught the line and drew warm applause from his illustrious rival.

The threat was snuffed out as Djokovic began to find his rhythm, a fact highlighted by his break of serve at the next opportunity, sealed when Goffin double faulted.

An otherwise underwhelming first set was lit up in the fifth game by a stunning rally that ended when Goffin sprinted to get underneath Djokovic's drop shot and send a superb lob into the corner.

The reigning champion spent much of his next change of ends arguing with the umpire following a time violation, but broke straight after and then served out the set.

Djokovic quickly got to work in the second and was rarely troubled, his heated exchange with the official having apparently spurred him on.

He capitalised on some uncertain Goffin service games to wrap up a convincing triumph in which the 12-time grand slam champion scarcely had to get out of first gear.

STATISTICAL BREAKDOWN

Djokovic [2] bt Goffin [9] 6-1 6-2

WINNERS/UNFORCED ERRORS 

Djokovic - 7/17
Goffin - 11/21

ACES 

Djokovic - 3
Goffin - 1

BREAK POINTS WON 

Djokovic - 4/6
Goffin - 0/1

FIRST SERVE PERCENTAGE 

Djokovic - 60
Goffin - 46

PERCENTAGE OF POINTS WON ON FIRST/SECOND SERVE 

Djokovic - 82/36
Goffin - 59/36

TOTAL POINTS 

Djokovic - 61
Goffin - 42