ZURICH (Reuters) - Francine Niyonsaba of Burundi finished a frustrating season on a high with another impressive victory over 5,000 metres on a temporary city-centre track in the opening session of the two-day Diamond League final on Wednesday.

For the third time in two weeks Niyonsaba outkicked Kenya's Tokyo Olympics silver medallist Hellen Obiri to take the honours on a curtain-raiser evening before Thursday's main event that features a galaxy of stars.