Germany Francesco Friedrich is on course towards an unprecedented back-to-back golden Olympic bobsleigh double by taking the overnight lead Saturday with his four-man team. Friedrich and his crew rebounded from second after the first run to first after two, leading another German bob from Johannes Lochner by three-hundredths of a second. Justin Kripps of Canada takes third place into the final two runs on Sunday but is under pressure from the third German bob of Christoph Hafner. Friedrich, Lochner and Hafer had swept the two-man medals earlier in the week. Friedrich won both men’s events 2018…