Double Olympic medallist Nick Willis is still alive in the 1500m, at the age of 38.
Willis finished seventh in the third heat, one place outside automatic qualification, but was among the six fastest "losers" across three heats who still go through to Thursday's semifinals in Tokyo.
Willis - the oldest man to win an Olympic 1500m medal - ran a cagey race and was often just in the top six, but faded in the final stretch in recording a season's best 3:36.88.
Willis is at his fifth Olympics, having won a bronze and silver already. He's unlikely to figure in the medals but it was an amazing run at his age to make the semifinals and he had the 14th fastest time.