Castres Olympique won against Stade Toulouse on the lawn of Pierre-Fabre (27-10) during the 21st day.
An important success for the CO which has a second consecutive victory in the league after that against Lyon.
The Toulousains, who played with a reorganized workforce, leave the Tarn with no points but remain solid leaders.
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Fixtures and Top 14 results
Ranking Top 14