The 2021 SPAR Challenge Series was the sixth Diamond Challenge netball series.. The series was played at the Cape Town International Convention Centre and broadcast live on SuperSport in South Africa. It was originally scheduled to be played in January 2021, however it was delayed due to a resurgence of the COVID-19 pandemic in South Africa. It was eventually played in March 2021. It was effectively two separate series played alongside each other. South Africa, Namibia and Uganda played each other in a Tri Nations Series that earned them points on the World Netball Rankings. Meanwhile, two invitational teams, a Netball South Africa President's XII and the Baby Proteas played each other in a series of five matches. These two teams were basically the South Africa B and under-21 teams respectively. Both the South Africa and Uganda squads did not feature any players from the Netball Superleague, Suncorp Super Netball or the ANZ Premiership. South Africa won the Tri Nations Series, winning all six of their matches while the President's XII won their series against the Baby Proteas 4âÂÂ1.