South Africa spearhead Kagiso Rabada is urged to study Australia captain Pat Cummins after an expensive first innings at the MCG.
"For KG, he's a wicket-taker, he always has that ability to take wickets for us, the challenge for him is to be able to control that," Langeveldt said.
"I think Cummins when he started off he leaked a few runs but then he got consistent and he was aggressive and that's his [Rabada's] challenge going forward. "He is one of the leading wicket takers in red-ball cricket but going forward playing on flatter wickets I think that's going to be the challenge for him."
South Africa will resume on Thursday at 1-15, still requiring another 371 to make Australia bat again in the Boxing Day Test.
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