Jalen Green, Cole Anthony, Juan Toscano-Anderson and Obi Toppin in Slam Dunk Contest Shams Charania: Sources: Houston Rockets rookie Jalen Green will headline the NBA Slam Dunk Contest at All-Star Weekend in Cleveland. Expected participants: Sources: Houston Rockets rookie Jalen Green will headline the NBA Slam Dunk Contest at All-Star Weekend in Cleveland. Expected participants: pic.twitter.com/5Y7rAmESF8 — Shams Charania (@ShamsCharania) February 1, 2022