PARIS — Marta Kostyuk reached the quarterfinals at the French Open for the first time on Sunday by taking out four-time champion Iga Swiatek 7-5, 6-1 and ruining her birthday.Kostyuk, who is undefeated on clay this season, had lost their three previous matches and never taken a set against the former top-ranked player, who turned 25 on Sunday.She defended extremely well, chasing Swiatek’s shots all over the court, and also produced some stunning groundstroke winners while her rival was also undone by her own mistakes.An intense baseline battle unfolded from the outset and Swiatek earned the first break when she overwhelmed Kostyuk after a long rally with a backhand winner. Kostyuk broke back immediately, though, only to drop her serve again and hand Swiatek a 5-4 lead.The Polish player showed signs of nerves as she double-faulted, shanked a forehand wide and then missed a volley at the net, allowing Kostyuk to level at 5-5. Swiatek hit two more double faults in the 12th game and the 15th-seeded Ukrainian player sealed the set with a backhand passing shot.Swiatek then briefly left the court. Meanwhile, Kostyuk kept herself warm by stretching and hopping beside her chair, then received some applause as she did a few dance moves to the music playing in the stadium.Following a first week marked by a suffocating heatwave, relief fina …
