Alex Ovechkin scored early and late, Tomas Vokoun made 25 saves, and the Washington Capitals got one back against one of their worst nemesis of the season Friday night, beating the Buffalo Sabres 3-1. One of Ovechkin’s two goals was actually a pass attempt that got deflected into the net, but the Capitals captain has five goals in seven games, a further sign that he is emerging from the spotty play that has run parallel to Washington’s slow start.