Mainz failed to get a lifeline in their fight against Bundesliga relegation when they were held 1-1 by fellow strugglers Union Berlin on Wednesday. Jonathan Burkardt gave Mainz the lead into the far corner but Union levelled five minutes later from Germany defender Robin Gosens on a rainy night. Both goals came deep into almost 15 minutes of first half stoppage time, caused by a lengthy interruption after fans had thrown tennis balls onto the pitch in ongoing protests against German Football League plans to bring in a strategic partner. Union’s Kevin Volland hit the crossbar and post in the fi…