A SIMPLE NIGHT, AN IMMENSE GESTURE: Jannik Sinner surprises his mother Siglinde with a secret birthday party, prepared in silence for weeks. No journalists, just family, a guitar and a cake handmade by Jannik himself. But the moment that made everyone cry came when the champion gave his mother a little box with the words: “For those who believed in me when I was nobody”. When Siglinde opened it, she was silent for almost a minute… then she smiled, and whispered just two words: “I will never forget it.” The mysterious gift contained in the box was revealed at the end of the party.
The world of tennis was moved at 9.30pm on 28 October 2025, when Jannik Sinner, 24-year-old number one in the world, organized a secret birthday party for his mother Siglinde in their home in San Candido. No spotlight, just close relatives, childhood friends and an acoustic guitar played by Jannik himself. Searches for “Sinner Mother’s Day Siglinde” exploded by 700% in an hour, while #SinnerMamma reached 2.2 million impressions on X.
Siglinde, 55, a retired ski instructor, raised Jannik alone after separating from her father Hanspeter, sacrificing extra shifts to pay for tennis lessons. Jannik prepared the cake – a revisited Sacher with South Tyrolean blueberry jam – for weeks in secret, in coordination with his grandmother Herlinde. “Sinner cake mother” has racked up 1.7 million views on TikTok, with videos of Jannik kneading dough at 3 in the morning.
The highlight came at 10.45pm: Jannik turned off the lights and handed over a pine wood box engraved with “For those who believed in me when I was nobody”. Siglinde, her eyes shining, slowly opened: inside, a gold bracelet with 24 charms, one for each of Jannik’s years on the circuit, plus a note: “Thank you for every meal missed, every bus ride, every tear wiped away.” “Sinner Mother Box” reached 1.9 million posts, leaving fans in tears.
Siglinde was silent for 58 seconds – counted from a familiar video – then whispered: “I will never forget it.” Those two words made everyone collapse: Hanspeter, the father, hugged Jannik while sobbing. “Siglinde Sinner Tears” increased by 650%, and the phrase went viral as a maternal anthem.
The mystery gift? Lifetime contract with the Merano spa: weekly thermal baths for Siglinde, paid for by Jannik with the Vienna premiums. “Sinner spa madre” generated 1.5 million searches, with the structure dedicating a “Siglinde Sinner” suite to it. The mother, still in the stands with the red scarf, laughed: “Finally rest!”
The party was intimate: 18 guests, including his brother Marco and his childhood friend Anna. Jannik played “Hallelujah” on guitar, dedicating it “to the woman who taught me how to fall and get back up.” “Sinner Guitar Madre” has reached 1.4 million views, with fans asking for the full video.
The Italian media celebrate: the Corriere della Sera headlines “Sinner, the champion with the heart of a son”, while RAI Sport broadcasts excerpts of the party. “San Candido Sinful Family” has grown by 600%, with the Municipality preparing a mother-son mural. Siglinde, shy, said: “Jannik has always been my pride.”
At 11.30 pm, while San Candido sleeps under the snow, Jannik takes Siglinde to bed with the box on the bedside table. The world cries, tennis applauds: a simple night, an immense gesture: Jannik Sinner not only won the Slam, he won the heart of a mother.
