Bordeaux came back from an 11-point deficit to defeat Toulon 28-23 in the Top 14 at the Stade Chaban Delmas.
Lyon restored their two-point lead at the top of Ligue 1 after Clinton Njie's late goal salvaged a 1-1 draw at Lorient.
Clermont and Stade Francais both suffered losses in the Top 14, leaving them locked together with new leaders Toulon.
Team news for Sunday's European Rugby Challenge Cup Pool 4 meeting of London Welsh and Lyon at the Kassam Stadium.
Marseille cut the gap to Ligue 1 leaders Lyon to a single point with a late 2-1 win over Guingamp on Sunday.
Top 14 leaders Stade Francais lost 12-9 at Lyon after a red card for Morne Steyn saw them play most of the game a man down.
Stade Francais shocked defending champions Toulon 30-6 to end the year at the summit of the Top 14.
Wins for Toulon and Clermont at the weekend has kept the race for top spot alive in France's Top 14.
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