PARIS — Maja Chwalińska had straightforward goals three weeks ago. There were two of them, but they were simple. Best not to muddle the mind.Chwalińska, a Polish 24-year-old who had yet to spend a full year on the WTA Tour, had the long-term goal of cracking the top 100 by year’s end. Her short-term aim was to qualify for Roland Garros.After nine wins on the clay courts of Paris, the world No. 114 is the lowest-ranked French Open finalist in the past 40 years.Chwalińska defeated Diana Shnaider on Thursday, 7-6(4), 6-4 in a semifinal that has a strong claim as the most compelling women’s match of the tournament. With unshakable composure, jaw-dropping shotmaking and extraordinary defense that was especially impressive given her diminutive stature, Chwalińska became just the second qualifier to reach a Grand Slam final in the Open Era. Emma Raducanu, the 2021 U.S. Open winner, was the first.She will face 19-year-old Mirra Andreeva in Saturday’s final. It will be her 10th match this French Open, including the three rounds of qualifying.Thursday featured a semifinal slate full of young players, lesser known than the likes of Aryna Sabalenka, Iga Świątek and Coco Gauff, especially to casual fans. It was the first Grand Slam singles event since 2011 where all of the final four women standing were under 25.Shnaider and Chwalińska (pronounced “Hva-LEEN-ska”) were the considerably less experienced pair, and it showed in the freedom with which they played. Chwalińska, 24, played the first tour-level semifinal of her career Thursday.