Argentina reached the Davis Cup Finals group stage by eliminating Kazakhstan 3-2 in the best-of-five-match qualifying round when Sebastian Baez erased two match points and came back to edge Dmitry Popko 6-4, 3-6, 7-6 (6) on Sunday. Belgium, Chile, the Czech Republic and France also wrapped up victories Sunday. Baez is a 23-year-old who is…