Proteas bowling coach Charl Langeveldt has posed a challenge for lead pacer Kagiso Rabada to be better with his control after South Africa chased leather on the third day of the second Test against Australia at the Melbourne Cricket Ground.Australia's 575/8 declaration came at a run-rate of 3.96, which represented a better return from the 4.24 the hosts coasted at on the second day.However, it remained a black mark that the Proteas, who pride themselves on having an excellent bowling attack, were taken to the cleaners by Australia.ANALYSIS | Proteas' gun bowling unnecessarily carries scars of deficient batting Unless Australia's off-spinner Nathan Lyon (44) has a field day on Thursday, Rabada (47) stands in line to become the leading Test wicket-taker in 2022.Of the top 10 bowlers this year, Rabada has an eye-popping economy rate of 3.90, which is why Langeveldt implored for better control from Rabada."KG is a wicket-taker, but the challenge for him is to be able to control that," Langeveldt said."When Pat Cummins started, he leaked a few runs, but he became more consistent, and I think that's KG's challenge going forward."At the moment, he's one of the leading wicket-takers in red-ball cricket, but playing on flatter wickets may be the challenge for him."READ | Langeveldt concedes bowlers had 'tough' MCG shift, says batting blowout is group workThe Proteas bowlers were always going to have an arduous task when SA fell for 189 in the first innings on the first day.That meek batting display effectively handed the Test to Australia, who then batted with the necessary patience and measured aggression.David Warner (200) and Alex Carey (111) ensured the Proteas can only play for a draw or ensure Australia at least bat again.T