Dwight Powell walked to the bench with blood streaming down his forehead while teammate Kessler Edwards lay flat on his back holding his head. The Dallas Mavericks have lost Kyrie Irving to a season-ending knee injury, and there's no timetable for Anthony Davis' return after the star forward injured a groin in his Dallas debut following the stunning trade that sent Luka Doncic to the Los Angeles Lakers. The latest might be the lowest for the Mavs.