Victor Estrella Burgos will be hoping to go back-to-back in Quito after the inaugural champion booked his spot in the Ecuador Open final.
Estrella Burgos won the first edition of the tournament last year and could make it two from two after seeing off Albert Ramos-Vinolas 6-2 7-6 (7-5) in their semi-final on Saturday.
The Dominican smashed seven aces past his Spanish opponent and won 90 per cent of points on his first serve, compared to Ramos-Vinolas' success rate of 67 per cent.
The defending champion will come up against third seed Brazilian Thomaz Bellucci.
Bellucci progressed to the final after a gruelling 3-6 6-2 6-3 win against Italian Paolo Lorenzi, which took almost two hours.
Lorenzi took an early lead after winning the first set, but failed to match his strong opening as Bellucci dominated the next two sets to claim the match and move into the final.
The Brazilian struggled with Lorenzi's serve early on, who finished eight aces, and served up six double faults of his own
However, Bellucci was able to take full advantage of the Italian's second serve, winning 55 per cent of second-serve return points, while claiming 72 per cent of his own.
Sunday's final will be the third time Bellucci has taken on Estrella Burgos.
The Dominican defeated Bellucci in the final of the Claro Open in Bogota after the Brazilian retired hurt in the second set of the Challenger event final, having lost the first set 6-2 and being 3-0 down in the second.
They also faced in Quito last year, when Estrella Burgos defeated the world number 35 in a tight semi-final 7-6 (7-5) 7-5.