NBA free agency began on Monday evening, and one of the first reported trades will mean big changes for the Denver Nuggets.

The Brooklyn Nets reportedly traded forward Cam Johnson to the Denver Nuggets for forward Michael Porter Jr. Here's how Brooklyn graded in the deal.

There is nothing like the start of NBA free agency, and last night's frenzy certainly lived up to the billing with big trades, big contracts and big statements. We'll start with the biggest surprise: The Nuggets traded Michael Porter Jr.