Fly-half Ryan Mills scored the decisive drop goal in the final minutes as Worcester Warriors went on to edge out Ospreys 18-20 in their Challenge Cup clash at Liberty Stadium on Saturday.
With the next European window beginning this weekend, Rhiannon Garth Jones takes a look back at an interesting block of Pro14 fixtures for the Welsh regions.
Ospreys have moved to the second position in the table as they went on to beat 27-10 in their Pro14 clash against Benetton Treviso in Swansea on Saturday.
Wales international Dan Biggar played his first game for Northampton Saints as English Premiership side completed a 26-13 victory over Ospreys in the pre-season friendly in Bridgend.
Craig Gilroy scored a double as Ulster thumped Ospreys 35-17 in the Pro 14 play-off in Belfast to book a place in the next season of European Champions Cup.