German tennis stars Alexander Zverev and Angelique Kerber have reached the round of 16 at the tennis tournament in Indian Wells, California. Olympic champion Zverev beat Dutchman Tallon Griekspoor 7-6 (9-7), 6-3 at the Masters tournament on Sunday. Zverev had to fend off five set points in the first set against Griekspoor, but won the tie-break. The 26-year-old will next face Alex de Minaur from Australia. Jan-Lennard Struff, on the other hand, was eliminated. The 33-year-old had no chance against the Australian Open winner and world number three Jannik Sinner and lost 3-6, 4-6. In the women’s…