A tough turnaround after some intense racing and a mixed bag of results sees the Australian team facing a challenging task in the London round of the Dextro Energy Triathlon – ITU World Championship Series this weekend.  Emma Moffatt returned to the top of the world rankings with a silver medal in Hamburg on Sunday, but leads by just four points from Japan’s Mariko Adachi, while previous series leader, Chilean Barbara Riveros Diaz, returns this weekend having sat out the Hamburg event.