The 2009–10 season saw Munster finish top of their Heineken Cup pool once again. Victories over Northampton Saints, French Top 14 champions USA Perpignan and Italian side Benetton saw Munster qualify for the Heineken Cup Quarter Finals for a record 12th consecutive year. The match took place at Thomond Park, where Munster played Northampton Saints for the third time that season and won 33–19. They lost 18–7 in the semi-finals against Biarritz at the Anoeta. Munster came 4th in the Celtic League, but because this season saw the introduction of a playoff system for the top four teams, Munster met and lost 16–6 to Leinster in the play-off semi-final.