Ghaemmaghami scored eight wins and two draws in the tournament underway in Philadelphia, USA.
Armenian grands masters Zaven Andriasian and Hovhannes Gabuzyan finished in second and third place respectively.
Blitz chess, also known as Speed Chess, is a single, time-controlled game of 1-10 minutes. Playing Blitz chess creates a flurry of moves, as both players hustle to complete their respective halves of a chess game, depending on which rule set they're playing under.
The 47th Annual World Open is being held from July 2-7 in Philadelphia, Pennsylvania.