Hooker Scott Otten crossed for two tries as Ospreys celebrated only their second Guinness Pro14 victory of the season as they edged out Ulster 26-24 at a rain-swept Liberty Stadium.

Scarlets made it two Guinness PRO12 wins from two after overcoming a big Ulster side 22-12, despite being reduced to 14 men for 27 minutes in total at Parc y Scarlets.

Scarlets 43 Ulster 17

Coleraine's Intertoto Cup adventure came to a halt as Troyes inflicted a second 2-1 defeat on the Northern Irishmen in a week.