Borussia Dortmund returned to winning ways 2-0 at Union Berlin on Saturday to keep fourth place in the Bundesliga in a duel with RB Leipzig who triumphed 4-1 in Bochum. Dortmund rebounded from a painful 3-2 home defeat against Hoffenheim from Karim Adeyemi in the 41st and Ian Maatsen in the 90th. That made them stay fourth, one point ahead of Leipzig who had to play catch-up in Bochum after falling behind from Maximilian Wittek’s free-kick. Dani Olmo levelled, and Lois Openda, an own goal by Ivan Ordets and Yussuf Poulsen then secured victory within a span of minutes minutes between the 68th a…