Beal, who suffered the injury Saturday against the Pacers, had already been ruled out for Monday's road game against the Hawks. The NBA's second-leading scorer this season now will also miss Wednesday's game in Atlanta.
Beal injured his hamstring late in Saturday's 133-132 win over Indiana. He checked out of the game with 21 seconds left in regulation and missed all of overtime after scoring 50 points.
The Wizards (32-36) lead the Pacers (31-36) by a half-game for ninth place in the Eastern Conference and trail the Hornets (33-35) by one game for eighth.
Beal also is in a tight race with Stephen Curry for the NBA scoring title. Curry is averaging a league-leading 31.9 points per game -- just ahead of Beal (31.4) -- with four games remaining on Golden State's regular-season schedule. The two superstars traded monster games Saturday night, with Curry scoring 49 points just hours after Beal's 50-point game.