Hertha Berlin coach Felix Magath has praised the work of crosstown rivals Union Berlin on the eve of their Bundesliga derby on Saturday. Magath said that Union “have a plan and stuck to it,” naming coach Urs Fischer and president Dirk Zingler key figures in Union’s rise over the years. “if you look at the mentality they have paid more attention to the mentality of the players than their potential. They have been quite successful with that,” Magath said. Union are seventh while Hertha are second last in the fight against relegation. Union have won both of their season meetings, 2-0 in the Bunde…