The Brooklyn Nets' shooting guard is shooting 47.1 percent from three-point range this season, which is the second-best mark in the National Basketball Association.
Warriors star Stephen Curry, who won the three-point contest in 2015, looked like a strong challenger to Harris entering the final round.
Harris drained nine straight shots, including his entire money ball rack, to finish the final round with 26 shots. That bet was settled quickly, after Steph made the last 10 shots in the first round, and Seth was knocked out.
Harris, who now plays for the Brooklyn Nets, finished his first round with 25 points.
Harris, though, turned the tides in the finale.
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Hield put up 19 points in the finals to settle for 3rd.
Other competitors included Milwaukee's Kris Middleton, Dallas' Dirk Nowitzki, Toronto's Danny Green and Portland's Damian Lillard.
This is the second time Curry has lost the coveted 3-point contest.
"The previous two rounds, the guy was ahead of me", Tatum said.
Though Curry came up short in the 3-point contest and lost to Joe Harris, that jacket made him a victor.
Defending champion Spencer Dinwiddie of the Nets was unable to defend his title because of an injury.