Holders Celtic booked their place in the last eight of the Premier Sports Cup with a 4-1 win over Ross County at the Global Energy Stadium.
Kevin van Veen hit a hat-trick as Motherwell saw off Inverness Caledonian Thistle 4-0 at Fir Park while Dundee United won 2-1 at Livingston.
Innes Cameron got the only goal midway through the first half as Kilmarnock beat Heart of Midlothian 1-0 at Tynecastle.
