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Van Assche, who stunned top seed Andrey Rublev on his way to the showpiece match, needed two hours and 24 minutes to seal a 6-4 4-6 7-5 victory in Portugal. 

Both players struggled on serve in the early exchanges of the first set, with five consecutive breaks opening the match before Van Assche was able to hold in the sixth game. 

From there, Van Assche held firm and took the lead heading into the second set, quickly racing into a 2-0 lead after getting the better of Blockx's serve again. 

However, the Belgian regained his composure and reeled off the next five games, and even with a late break from Van Assche, he was able to take the match to a decider.

The theme of the match continued in the third set as Van Assche surged 3-0 in front, only for Blockx to close the gap with a break of his own to go within one game of levelling. 

Van Assche missed two opportunities to get the better of his opponent's serve in the seventh game, and Blockx made the most of his reprieve to cancel out the advantage and set the score at 5-5. 

But the Frenchman responded with a break of his own in the following game before sealing the title on serve at the first time of asking.