Saracens edge out a stubborn Ospreys side to maintain their 100% start to their Champions Cup defence at Allianz Park.
England back Alex Lozowski signs a new contract with Saracens, and will remain at the club until the summer of 2020.
Saracens score eight tries as they begin their quest for a third successive Champions Cup by thrashing Northampton at Franklin's Gardens.
England hooker Jamie George signs a long-term contract extension with Premiership side Saracens.
Audio & Video
Wales full-back Liam Williams plays his last game at Parc y Scarlets on Saturday before leaving Scarlets for Saracens, so we pick out some of his best moments for the Llanelli-based region.
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This week's sport on the BBC includes commentary of the European Rugby Champions Cup, Champions League football and the United States Grand Prix.