Germany’s Jan-Lennard Struff battled past Frenchman Benjamin Bonzi 6-4, 2-6, 7-5 to give the hosts a 1-0 lead in their Davis Cup group tie on Wednesday. Struff, ranked 132 in the world, crucially broke for 6-5 in the third set and prevailed in the final game thanks in part to his 13th ace of the contest. World number 53 Bonzi wasted a break point in that decisive game at the Rothenbaum tennis centre hardcourt in Hamburg. German Olympic champion Alexander Zverev, who was meant to make his comeback from a long-standing foot problem in the Davis Cup before re-injuring himself, watched on from the…