Defending European Cup champions Munster blew the Ospreys away at Thomond Park, winning 43-9 to book a place in the semi-final.
Munster now face countrymen Leinster, who beat Harlequins 6-5 at the Stoop on Sunday.
Munster were superior in all facets of play and secured victory through tries by Paul Warwick, Paul O’Connell and a brace from centre Keith Earls. Warwick contributed two drop-goals, while flyhalf Ronan O’Gara banked 17 points through four conversions and three penalties.
The scoreline of the Leinster-Harlequins clash didn’t fully reflect a superb contest marked by punishing defence.
The Quins spent much of the second half camped in Leinster’s territory, but the Irishman remained patient on defence and ultimately hung on for a memorable victory secured through the boot of Felipo Contepomi, whose two penalties trumped a try by Quins fullback Mike Brown.