Zverev and Kerber at the Australian Open: With heart and self-confidence

It was a day when many feared stumbling and stumbling. The early, bitter end at the Australian Open for Angelique Kerber and for Alexander Zverev. But shortly before midnight, almost in step, the two front figures of the German tennis caravan played their way into the second round of Grand Slam in Melbourne pretty confidently - within 60 seconds.