Daria Kasatkina came back from one set down to beat Marta Kostyuk 3-6 6-4 6-3 in 2 hours and 24 minutes reaching the second round at the Toray Pan Pacific Open in Tokyo.
Katatkina is playing her first tournament since the US Open, where she lost to Aryna Sabalenka in the fourth round.
Kasatkina set up a second round match against Greek qualifier Despina Papamichail, who beat Japanese lucky loser Sakura Hosogi 7-6 (7-3) 7-5 in 2 hours and 19 minutes.
Kostyuk dropped just eight points on serve and broke serve in the fourth game to close out the first set 6-3. The second set featured nine service breaks in ten games. Kostyuk went up a break three times, but Kasatkina pulled back on serve each time. Kasatkina broke in the eighth and tenth games to seal the second set 6-4.
Kostyuk went up a break twice in the third set, but she was broken back both times. Kasatkina drew level to 3-3, as Kostyuk made a overhead error, and won the final four games to seal the third set 6-4.
Anastasya Pavlyuchenkova cruised past Donna Vekic 6-1 6-1 in just 74 minutes. Nineteen-year-old Linda Noskova saved one set point to beat Japanese lucky loser Himeno Sakatsume 6-2 7-5 setting up a second round against Anastasya Pavlyuchenkova.
Ekaterina Aleksandrova came back from one set down to beat Anna Kalinskaya 6-7 (7-9) 6-1 7-5 in 2 hours and 21 minutes setting up a second round against Liudmila Samsonova.
