angelique kerber rallied past madison keys to win the family circle cup on sunday , capturing six of the last seven games for a 6-2 , 4-6 , 7-5 victory .
this was kerber 's fourth wta title and first since linz in 2013 .
the german broke serve five times against an opponent who had n't lost serve all week .
kerber fell to the ground and covered her face in celebration when keys ' final shot sailed long .