Klaasen smashed 123 off 114 deliveries as South Africa won the 1st ODI by 74 runs.
The Rocks have lost a solitary game out 6, and that was against the Spartans by 8 wickets at the Boland Park.
Rain seems to be following these two teams everywhere.
In the pressure situation, Heinrich Klaasen scored 31 off 13 balls to put his team in a commanding position.
In 2018, the Spartans won both the matches versus the Rocks.
The pitch at the SuperSport Park generally helps the fast bowlers to a large extent.
Last season, the Spartans lost both their matches against the Heat.
Klaasen is currently with the South Africa A side for the unofficial one-day series in India.
The right-handed and left-handed duo are seen playing clean shots at the nets and are all set for the clash on Sunday.
Hashim Amla and JP Duminy are added to the squad of Cape Cobras.