Misaki Doi will feature in her maiden WTA final on Sunday after Alison van Uytvanck retired in their last-four meeting at the Luxembourg Open.
Doi, the world number 92, followed up her impressive victory over Jelena Jankovic by taking the first set 6-4 in the second of Saturday's semi-finals.
And Van Uytvanck then called a halt to her participation, ensuring Doi will face Mona Barthel for the title.
Barthel - a three-time winner on the WTA Tour whose last success came in Bastad last year - enjoyed a comfortable 6-2 6-3 victory over Stefanie Voegele earlier in the day.
After an even start, Barthel seized control by reeling off seven games in succession to win the first set and move 3-0 up in the second.
Another break of the Voegele serve put Barthel within a game of the final and, although the German then dropped serve for the first time, she duly served out the match at the second attempt.