Angelique Kerber is looking forward to playing in her native Germany again this week but has mixed feelings about her fitness after catching a cold recently. Former world number one Kerber is expected to face former US Open champion Emma Raducanu on Wednesday at the Porsche Grand Prix in Stuttgart where she lifted the trophy in 2015 and 2016. Kerber returned from maternity leave at the start of the season and has won four of her 12 matches so far. She fell ill around Germany’s Billie Jean King Cup tie in Brazil last weekend where she didn’t play in her team’s 3-1 victory. She now simply hopes …