Men's 800m
Botswana's Otukile Lekote was the fastest qualifier for the semi-finals with a time of 1:47.68.
Defending champion Japhet Kimutai won his heat in 1:49.62 with his Kenyan team-mate Joseph Mutua and South Africa's Mbulaeni Mulaudzi other heat winners.
Northern Ireland's James McIlroy, English duo Joel Kidger and Neil Speaight and Wales' Matthew Shone were among the qualifiers but England's 1992 Olympic finalist Curtis Robb missed out.
Women's 800m
Mozambique's Maria Mutola led the way in the first round of heats.
The Olympic, world and Commonwealth champion was the fastest qualifier for Sunday's semi-finals in 2:01.87, with Scotland's Susan Scott finishing impressively behind her.
Kenya's Faith Macharia, Nigeria's Grace Ebor, Diane Cummins of Canada and Namibia's Agnes Samaria also won heats.
English pair Charlotte Moore and Jo Fenn and Emma Davies of Wales were among the other qualifiers.
Decathlon
Jamaica's Bernard Claston extended his lead after the high jump, the fourth event, with Scotland's Jamie Quarry in third.