The men’s pair combination of Olympic medallists John Smith and Lawrence Brittain were the only crew to earn a qualifying spot for next year’s showpiece.
The duo needed to finish among the top 11 boats at the regatta to earn qualification.
Smith, an Olympic gold medallist, and Brittain, who won silver at the 2016 Rio Games, finished third in the B-final to get the job done. The Serbian crew won the race in a time of 6min 33.910sec, with the South Africans finishing in 6:35.040 after leading over the first 500 metres.
It was a reunion of sorts for Smith and Brittain as the duo won gold at the 2010 World Under-23 Championships.