Wimbledon 2015: Heather Watson undaunted by double Williams challenge

• British No1 faces top seed Serena but could then play Venus
• Watson had posters of sisters on wall when she was growing upFor Heather Watson the prospect of facing her childhood idol Serena Williams for the first time in the third round at Wimbledon on Friday would appear to be no more daunting than the likely consequences of an unlikely victory there: a fourth-round match against her sister, Venus. Related: How Heather Watson can beat Serena Williams – according to Alizé CornetC