The 28-year-old jumped 8.34m on Thursday and now leads the Diamond Race standings by five points.
It will give Rutherford confidence as he looks to add World Championship gold to his Olympic, European and Commonwealth titles.
Briton Lynsey Sharp was narrowly beaten by France's Renelle Lamote in the 800m.
The 2012 European champion, also part of the 62-strong GB Squad heading to China in August, ran a time of two minutes and 0.29s, with Lamote winning with 1:59.91s.
Martyn Rooney, in the GB 4x400m relay squad for the World Championships but not selected for the individual event, ran a season best of 45.41s to finish third in the 400m.
The World Championships take place 22-30 August.
