The American, already confirmed as 200m champion, leads the points from Amantle Montsho and has never lost to her.

Tyson Gay competes in the 4x100m relay but has opted to sit out the 200m.

Zurich is the final meet for 16 of the 32 disciplines - the rest taking place in Brussels on 27 August - with double points on offer in all events.

Although big-draw names like Usain Bolt, Kenenisa Bekele and Yelena Isinbayeva will be absent, the start list includes 10 Olympic champions, 12 world champions, and 16 European champions.

Felix is one of the stars on show is Felix and the 24-year-old is in pole position to pick up her second $40,000 cheque and Diamond League Trophy this season.