The NBA offseason has started off with a bang, and it hasn't shown any signs of slowing down any time soon. We have already seen some massive trades. Here, we are going to grade the biggest moves of the offseason so far for fantasy basketball.

F Giannis Antetokounmpo, Miami Heat

The Giannis trade was the big move we were all waiting for this offseason to start all the dominoes falling. We knew it was coming; we just didn't know where he was going to land. It looked for a while that the Boston Celtics were the favorite to win the former MVP, but the Heat ultimately swooped in and got the deal done.

This trade is great for everyone involved. Giannis goes to Miami, where he will have a much better supporting cast in a better system that will maximize his upside and have him competing at a much higher level than the Bucks have been for years now. His presence should also open things up for everyone else as well.

In Milwaukee, Tyler Herro should get all the opportunities he wants this season as the team looks to rebuild. There is still a chance that he gets moved again; nevertheless, he should thrive with the Bucks from a fantasy perspective.