In 1999, Duncan was in his second NBA season, but didn't look much different than he does today. However, his first championship team did look a lot different, with David Robinson as the other star.
Duncan spent most of his career with Tony Parker, Manu Ginobli, and Gregg Popovich, including his final season.
But in 1999, his father, Dell Curry, was a player for the Toronto Raptors and Stephen Curry was playing one-on-one with his brother Seth during a TV segment.
After 9 seasons with the Oklahoma City Thunder, Kevin Durant just teamed up with Curry on the Golden State Warriors.
Likewise, Dwyane Wade just signed with the Chicago Bulls after spending his entire career with the Miami Heat.
Pau Gasol will attempt to fill the shoes left behind by Duncan, having recently signed with the Spurs.
But back then, he was a 15-year-old sophomore in high school starting to make noise in the Baltimore area. He didn't even have his signature cornrows yet.
Here is Harden in 1999 as a 9-year-old. Wait. This doesn't seem right.
James Harden killing it. Best costume so far. pic.twitter.com/4QSpA4gCLv
— Kem (@kimberlily) October 31, 2015