World number two Ons Jabeur suffered a shock quarter-final exit from the Jasmin Open on home soil in the Tunisian city Monastir on Friday.
Jabeur finished as runner-up at Wimbledon and the US Open this year, while also winning two tour titles, in Madrid and Berlin.
Her early exit is a blow for organisers of the tournament in Monastir, with the city on the central coast of Tunisia being the first in the country to host a WTA tour event.
The top seed at the tournament, Jabeur had beaten Ann Li and Evgeniya Rodina in straight sets to make the last eight.