Michael Johnson cancelled the final leg of the new Grand Slam Track series in Los Angeles before an emergency meeting with athletes on Thursday night

Grand Slam Track aimed to revive sport but attracted sparse crowds and was criticised for lack of field events and ‘doubling up’ format

Michael Johnson cancelled the final leg of the new Grand Slam Track series in Los Angeles before an emergency meeting with athletes on Thursday night

The final leg of Grand Slam Track - the athletics competition backed by Olympic great Michael Johnson - is cancelled because of economic concerns.