Biggar puts the boot into Ulster
The hosts fell behind to Paddy Jackson’s excellent try, the fly-half gliding through a gap after four minutes.
Jackson added the conversion, but then saw opposite number Dan Biggar chip away at the lead in the 13th and 27th minutes. Biggar put his side into the lead for the first time with a penalty after 30 minutes and added a fourth first-half goal to give Ospreys a 12-7 half-time cushion.