Refusing to yield momentum, ruthless Australia is perfectly set for victory

Momentum, most agree, is among the most elusive psychological phenomena in professional sport. How to obtain and maintain the positive kind? How exactly to halt and reverse its opposite? For three and a half days of this Durban Test, since Matt Renshaw began calmly pulling Australia's first innings out of the fire and seizing the game's initiative, Australia has stubbornly maintained control. South Africa, haphazardly, has failed to regain it.