Spiller competed at the 2025 Winter World University Games as the alternate for the Italian team[4] (skipped by Giacomo Colli). The team finished 5–4.
Spiller, and his team of brothers Stefano and Andrea Gilli, and lead Francesco Vigliani represented Italy at the 2025 World Junior Curling Championships, played at home in Cortina d'Ampezzo, Italy. With Spiller skipping, the team finished the round robin with an 8–1 record, in first place. The team then beat South Korea's Kim Dae-hyun rink in the semifinals, before beating Norway's Lukas Høstmælingen in the final to claim the gold medal,[5] [6] the first World Junior men's title for Italy.
The following month, Spiller and partner Lucrezia Grande represented Italy at the 2025 World Junior Mixed Doubles Curling Championship, the first time the event had been held. The pair went undefeated in pool play, with a 6–0 record. They then beat the United States, South Korean and finally Denmark (Katrine and Jacob Schmidt) in the final, to win his second junior gold medal in as many months.[7][8]
Spiller skipped the Italian team once again at the 2026 World Junior Curling Championships, this time with new lead Cesare Spiller, Stefano's twin brother.[9] There, the team had a weaker round robin, finishing with a 6–3 record. The team then upset Scotland's Orrin Carson rink in the semifinal, before losing to the United States' Caden Hebert in the final.[10]
Spiller's junior rink also competed on the men's tour during the 2025–26 curling season, where they won the Danish Open[11] and the Sun City Cup.[12][4]
Only a few weeks after winning the World Junior silver medal, Spiller was chosen to skip the Italian men's team at the 2026 World Men's Curling Championship, following the decision of longtime skip Joël Retornaz to miss the tournament.[13][14]
Italy
