Josh Kerr opens up on his intense rivalry with Jakob Ingebrigtsen as the Scottish record-breaking runner attempts to be 'the best in the world' as they go head-to-head at the Prefontaine Classic

Josh Kerr resumes his bitter rivalry with Jakob Ingebrigtsen on Saturday night insisting he has gone up a level since they last went head to head, and claiming he is ready 'to be the best in the world.'