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 small box engraved: “For those who believed in me when I was nobody”. When Siglinde opened it, she remained silent for almost a minute… then she smiled, and whispered just two words: “I will never forget it.” The mysterious gift in the box was revealed at the end of the party.
The tennis world was moved at 9.30pm on October 28, 2025, when Jannik Sinner, the 24-year-old world number one, 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 and a retired ski teacher, raised Jannik alone after separating from her father Hanspeter, sacrificing extra shifts to pay for tennis lessons. Jannik made the cake—a revisited Sacher with South Tyrolean blueberry jam—for weeks in secret, coordinating with his grandmother Herlinde. “Sinner cake mother” has totaled 1.7 million views on TikTok, with videos of Jannik kneading dough at 3 am.
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, 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, with fans in tears.
Siglinde was silent for 58 seconds—counted by a familiar video—then whispered: “I will never forget this.” The two words made everyone collapse: Hanspeter, the father, hugged Jannik while sobbing. “Siglinde Sinner Tears” rose 650%, with the phrase going viral as a maternal anthem.
The mystery gift? A lifetime contract with a spa in Merano—weekly thermal baths for Siglinde, paid for by Jannik with Vienna premiums. “Sinner spa madre” generated 1.5 million searches, with the facility dedicating a “Siglinde Sinner” suite. The mother, still in the stands with a red scarf, laughed: “Finally rest!”
The party was intimate: 18 guests, including his brother Mark and his childhood friend Anna. Jannik played “Hallelujah” on guitar, dedicating it to “the woman who taught me how to fall down and get back up.” “Sinner Guitar Madre” has reached 1.4 million views, with fans asking for the full video.
The Italian media celebrated: Corriere della Sera headlined “Sinner, the champion with the heart of a son”, while RAI Sport broadcast excerpts of the party. “Sinner family San Candido” has risen by 600%, with the municipality preparing a mother-son mural. Siglinde, shy, said: “Jannik has always been my pride.”
At 11.30pm, 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 didn’t just win the Slam, he won a mother’s heart.