**Angus O’Brien’s late try propelled Scarlets to a comeback Derby Day victory over Ospreys at a windswept Parc y Scarlets.** Toby Booth’s side led for the majority of the match but O’Brien’s late intervention, bolstered by 11 points from fly-half Dan Jones, helped Glenn Delaney’s side clinch the Welsh bragging rights 16-14 in Llanelli. Reuben Morgan-Williams scored a brilliant solo try for Ospreys and while Stephen Myler also kicked nine points, they were unable to hold on for a Boxing Day victory. **Key moments** Ospreys started steadily and were soon on the scoreboard when Myler battled the conditions to slot an early penalty.