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Four-division world champion Adrien “The Problem’’ Broner and three-division world champion Mikey Garcia square off in a blockbuster matchup in the main event of SHOWTIME CHAMPIONSHIP BOXING®, Saturday, July 29, presented by Premier Boxing Champions at Barclays Center, the home of BROOKLYN BOXING™. Plus, unbeaten former world champion Jermall Charlo returns to face Argentina’s Jorge Sebastian Heiland in a middleweight world title eliminator. Additional undercard action will see former title challenger Gerald Washington take on Brooklyn native Jarrell “Big Baby” Miller in a 10-round heavyweight matchup.