​Marta Kostyuk has three career titles [Getty Images]Marta Kostyuk is through to the quarter-finals of the Guadalajara Open even though the top seed is yet to play a point in the tournament.The Ukrainian received a first-round bye in Mexico and got a walkover in her scheduled second-round match on Wednesday, when Taylor Townsend withdrew because of an illness.Kostyuk, the world number 10, is now scheduled to get her tournament under way against the eighth-seeded Liudmila Samsonova of Russia, who edged Kayla Day 7-6 (7-4) 2-6 7-6 (7-5).Kostyuk claimed her maiden WTA 1000 title in Madrid in May and has reached the semi-finals of the French Open and Wimbledon this year.Most recently the 24-year-old lost to sixth seed Linda Noskova in the last 16 of the US Open.Charlotte to host WTA Finals from 2027Live scores, results and order of playGet tennis news sent straight to your phone