Kartal and Bouzas Maneiro were made to wait several hours to get onto court after thunderstorms held up play.
Even when they arrived at 18:15 local time, there was still a delay as the chair umpire and staff dried the court with towels.
Kartal sees herself as a “disrupter” but she was unable to unsettle Bouzas Maneiro in the early rallies.
Bouzas Maneiro managed to get on top in the baseline duels, knocking powerful winners off both flanks as she won 29 of the 44 points in a one-sided first set.
When Kartal lost serve and went 3-0 down in the second set, it looked as though she was heading towards a rapid defeat.
But Bouzas Maneiro began to look nervous, suddenly making more unforced errors as Kartal clawed back the break.
A chance for the Spaniard to clinch the match came at 5-4 30-40, but a tight forehand volley wide indicated the pressure she was feeling.
However, Kartal did not fully capitalise on her opponent’s tension.
The Briton moved 4-2 ahead in the tie-break, but was pushed back on her weaker backhand as Bouzas Maneiro wiped out the mini-break and turned the match back in her favour.
Bouzas Maneiro will now go on to face Sabalenka after the top seed started her bid for a third consecutive title with a straight-set win over American Sloane Stephens.