Mirra Andreeva thanked a fan for gifting her a "lucky charm" after cruising through the French Open's third round in straight sets.
Andreeva beat Yulia Putintseva 6-3 6-1 in just 76 minutes on Saturday to book her place in the fourth round.
She broke Putintseva's serve three times in the first set, including in a marathon final game where she converted her second set-point attempt to take the lead.
A five-game winning run in the second saw her storm past the Kazakhstani to become the youngest player to notch five grand-slam second-week showings since Nicole Vaidisova in the 2007 Australian Open.
Before the start of the match, a small colourful fabric patch with floral patterns was placed on her bench by a fan, who Andreeva thanked for giving her luck.
"When I was walking on court, a little girl put a drawing on my bench, and I kept it. It's my lucky charm," Andreeva said.
"Wherever that little girl is, I want to thank her because it is my lucky charm."
On her first meeting with Putintseva, she added: "I knew she's a very tricky player, she plays very interesting and makes it a little uncomfortable for me, so I struggled in the beginning.
"I practice against her, so I knew what to expect. I'm happy with the way I played today."
Andreeva will face Daria Kasatkina in the fourth round, after the Australian got past Paula Badosa.
Kasatkina held on to earn a 6-1 7-5 victory over the 10th seed in just over an hour and a half on Saturday.
Elsewhere, Jessica Pegula is also through to the next round after surviving an early scare against Marketa Vondrousova.
After losing the first set, Pegula fought back to earn a 3-6 6-4 6-2 victory to continue her run at Roland-Garros, with Lois Boisson next up.
Data Debrief: Making more strides
Andreeva is one of the in-form players at the French Open this year and has continued to impress in Paris.
She (18y 26d) is the youngest player to claim 30+ WTA-level match wins before the end of Roland-Garros since Maria Sharapova (2005) and the first teenager since Victoria Azarenka (2009).
Moving to a win-loss record of 10-2 at the event, she is also the youngest player to claim 10 women's singles match wins at Roland-Garros since Martina Hingis (16y 238d) in 1997.
