The third seed had a standout week, playing consistent and aggressive tennis to win his first title since winning in Lyon last May.
The final set of the match went to a tie-break with the Bulgarian recording a 6-4, 3-6, 7-6 (7-2) win over the Pole.
The 22-year-old played with a high level of intensity, widening his groundstrokes to pull his opponent around the court.
His playing style could generally be described as aggressive, and his level tends to fluctuate over the course of a match.
He started his professional tennis career in 2016. He won his first ITF Grade 1 in Canada at the Repentigny Internationaux de Tennis Junior
Alejandro Davidovich Fokina was Spanish Champion at U12, U15 and U18 levels. He started his professional tennis career in 2016.
The Serbian breezed past the Spaniard to reach his 15th quarterfinal at the Internazionali BNL d'Italia.