IBF, WBA and WBO light heavyweight champion Andre Ward (31-0, 15 KOs) will fight previous titleholder Sergey Kovalev (30-1-1, 26 KOs) in a rematch on June 17 at Mandalay Bay in Las Vegas.
Ward will defend the world titles he won from Kovalev by a disputed unanimous decision last November.
Kovalev scored a second round knockdown but the American battled back to win the closely fought contest -114-113 on all three scorecards.
The Russian has exercised his right to an immediate rematch.
Source: Andre Ward-Sergey Kovalev rematch set for June 17