Grigor Dimitrov wants to maintain his momentum after easing to victory over Pablo Carreno Busta in his final group match at the ATP Finals.

Dimitrov was already sure of top spot in Group Pete Sampras and a semi-final with Jack Sock, but did not take his foot off the gas against Rafael Nadal's replacement at the season-ending showpiece.

Carreno Busta never looked likely to trouble the Bulgarian, who eased to a 6-1 6-1 victory after just an hour on court.

Sock now stands between Dimitrov and a place in the final but, with Dominic Thiem the only player to win more than two games against the world number six so far in the tournament, the American will need to produce his best to knock him out.

Dimitrov needed just 22 minutes to clinch the first set having raced into a 5-0 lead, wrapping it up as Carreno Busta dumped a return into the net. 

Carreno Busta promptly dropped serve in the opening game of the second set and received medical treatment as the one-way traffic continued.

Again the Spaniard was able to avoid a bagel but a remarkable turnaround never looked likely, with Dimitrov's win sealed when Carreno Busta hit a simple forehand into the tramlines.

Speaking on court afterwards, Dimitrov said: "[It was] another good match, it's great when you have feelings like that. I just want to keep the momentum going.

"I'm just pretty relaxed right now. Jack has been playing unbelievable tennis, he's a very dangerous opponent. I'm just going to focus on what I can do and play hopefully the same game."

STATISTICAL BREAKDOWN
Dimtrov [6] bt Carreno Busta [10] 6-1 6-1

WINNERS/UNFORCED ERRORS 
Dimitrov - 15/9
Carreno Busta - 6/21

ACES/DOUBLE FAULTS 
Dimitrov - 3/2
Carreno Busta - 0/2

BREAK POINTS WON 
Dimitrov - 5/10
Carreno Busta - 0/0

FIRST SERVE PERCENTAGE 
Dimitrov - 55
Carreno Busta - 70

PERCENTAGE OF POINTS WON ON FIRST/SECOND SERVE 
Dimitrov 95/56
Carreno Busta 47/28

TOTAL POINTS 
Dimitrov - 56
Goffin - 28