Former world number one Angelique Kerber saved two match points as she claimed a first victory since her return from maternity leave, 4-6, 6-2, 7-6 (9-7), over Ajla Tomljanovic in the United Cup semi-finals on Saturday. Kerber’s victory in 2 hours 34 minutes in Sydney gave Germany a 1-0 lead over hosts Australia. Alexander Zverev could decide the tie ahead of the concluding mixed doubles with victory against Alex de Minaur. Kerber failed to serve out the match serving at 6-5, and then needed to save the two match points in the deciding tie-break before clinching victory on her first opportunit…