Germany’s 2018 champion Angelique Kerber was dumped out of Wimbledon following a 6-4, 7-5 defeat by Elise Mertens on Friday, but two other German women got through to the last 16 for the first time. Kerber had been looking good as she targeted a fourth grand slam singles title. But like so often in her career, the 34-year-old produced an insipid performance when it mattered most with the 24th seed prevailing over the 15th seed. Mertens broke for 3-1 in the first set but Kerber had chances in the second, twice gaining a service break to lead 5-3 but still coming up short. But Germany’s Jule Nie…