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As you'd expect from one of the worst teams in the NBA, Orlando hasn't been stellar defensively. They rank in the bottom half of the league, giving up 104.6 points per 100 possessions.
They haven't been terrible either though, thanks to solid defensive players on the perimeter like Oladipo and Arron Afflalo.
Things break down around the rim because of a lack of great interior defense.
Orlando is 21st in the league in blocks per game at 4.3, and really only has one rim protector in Kyle O'Quinn.
The 6'10" O'Quinn averages 1.3 blocks, but plays just 16.9 minutes. Vucevic and Harris get the majority of the playing time up front because of their offensive abilities, but they don't defend as well as O'Quinn.
Orlando allows 3.8 more points per 100 possessions when O'Quinn is on the bench. So what they need is for Vucevic and Harris to get better defensively, O'Quinn to get better offensively or perhaps an entirely different player.
Someone like Joel Embiid would fit the bill and could be available on draft night, depending on how the lottery plays out.
Of his offensive potential, CBSSports.com's Gregg Doyel declared Embiid, "...the best prospect at center in nearly a decade." He later added, "This kid could average, easily, 20-and-12 as a rookie."
And he's no slouch on defense either. In fact, that's what most pundits rave about with Embiid, including Bleacher Report's own Jonathan Wasserman:
Embiid has the ability to shrink the size of the rim he's defending thanks to those long, aggressive and disruptive arms that are constantly in motion.
Even if he's not blocking shots, he's changing or challenging them.
Whether or not the Magic have an opportunity to select Embiid obviously remains to be seen, but his game on both ends of the floor would make him a solid complement to either Vucevic or Harris in a three-man rotation up front.