As the NBA season tips off on Tuesday, The Post’s lead hoops writers — Stefan Bondy, Brian Lewis and Mike Vaccaro — ask and answer the key questions. 1. The biggest storyline of the NBA season is going to be ______ BONDY: The fate of Giannis Antetokounmpo. If the Bucks struggle — I’d say that’s likely — the league will be on the Giannis Watch until the Feb. 5 trade deadline. And if Antetokounmpo sticks with the Bucks, we’ll restart the watch in the summer. LEWIS: Giannis Antetokounmpo. Again.