Dublin-based Kenyan Freddy Sittuk and Northern Ireland's Commonwealth Games athlete Gladys Ganiel took the wins in Sunday's Belfast City Half-Marathon.
Sittuk battled with Annadale Striders's athlete Eddie McGinley before finishing four seconds clear in 1:07.33.
Raheny athlete Sittuk also won the Belfast City Marathon in May.
Ganiel, 37, finished one minute and six seconds ahead of her North Belfast club-mate Louise Smith in the women's race as she clocked 1:19.18.
Smith was 42 seconds ahead of third-placed Heather Foley while Keith Purdy completed the top three in the men's event after finishing three minutes and six seconds behind winner Sittuk, who also triumphed in the Walled City Marathon in Londonderry in June.
McGinley led Sittuk by one second as he reached the six-mile point in 31 minutes and 53 seconds.
Annadale athlete McGinley was using the race as part of his build-up towards his Dublin Marathon challenge in late October.
Ganiel, who finished an impressive 12th in the women's marathon at the Commonwealth Games in July, had forged a 25-second lead over Smith as she reached six miles in 36 minutes and 34 seconds.