NEW YORK--(BUSINESS WIRE)--Next-gen financial exchange Kalshi today released a new commercial starring NBA champion and Kalshi investor Giannis Antetokounmpo. The 60-second spot will premiere during Game 1 of the NBA Finals tonight. Inspired by Antetokounmpo's Greek heritage and set in the iconic world of Grease, the commercial is a playful homage to the classic film. Featuring Giannis alongside his brothers, Thanasis, Kostas, and Alex, the spot showcases a side of the NBA superstar fans rarely