Giddey has promise as a defender for the San Antonio Spurs
Both as a team defender and a rebounder, Giddey excels as a guard. Despite having a short wingspan for being 6'8 in addition to being a lower-tier athlete, he still finds a way to be a decent perimeter defender and a good rebounder.
Averaging over seven rebounds per game since his days playing for the U18 team, Giddey's knack for cleaning the glass provides him with significant position versatility and he will theoretically be able to roll out on the floor within a variety of lineups. Furthermore, because he recently weighed in at 220 pounds, indicating a significant weight gain, there's potential for Giddey to even defend power forwards on opposing teams.
With that in mind though, because he's gotten bigger and already was not the best athlete to begin with, his below-average lateral quickness that's associated with his underwhelming athleticism could give him some problems when defending shot-creating guards.
Even so, he has great defensive footwork, is strong at the point of attack, and can invade passing lanes well. He's more or less a swiss-army knife on defense that, while not quite on the level of a player like Ben Simmons as a perimeter defender, is reminiscent of players like Joe Ingles and Kyle Anderson. While his athletic limitations may limit him to primarily defending bigger wings and modern power forwards in today's NBA for the time being, he's polished, willing, and engaged and undeniably has more room to improve.