The 2010–11 season saw Munster drawn in Pool 3 of the Heineken Cup alongside Ospreys, London Irish and Toulon. Munster lost 23–17 away to London Irish, before defeating RC Toulon 45–18 at Thomond Park. Munster defeated Ospreys 22–16, but lost the reverse fixture at Liberty Stadium 19–15. In Round 5 Munster went to Toulon, losing 32–16. As a result, Munster failed to qualify for the quarterfinals of the Heineken Cup for the first time in 13 years. Munster won their final pool game, at home to London Irish, 28–14, and qualified for the 2010–11 European Challenge Cup quarter-finals. Munster defeated Leinster 24–23 on 2 April 2011 in the Celtic League, ending a run of 5 straight defeats. Munster beat Brive 37–42 in their Challenge Cup quarter-final to qualify for the semi-final against Harlequins on 30 April. Munster lost the semi-final in Thomond Park 20–12. Munster finished first in the 2010–11 Celtic League. They beat Ospreys 18–11 in their semi-final to set up a Grand Final with Leinster, which Munster won 19–9, securing a third Celtic League title.