His second shot into the green flew right into the sandtrap, leaving him with an mighty tough bunker shot downhill to the flag.
Rahm couldn’t aim for the flag or the ball would trickle down hill and into the water hazard at the back of the green.
The Spaniard did amazingly to pitch it back to the right of the flag, leaving him with another sweeping left-to-right putt.
Buoyed by his previous putt though, Rahm stepped over the ball with confidence and rolled it into the cup, sparking wild celebrations from the spectators to give him a one-shot lead.
Oosthuizen though still had a few holes to play and a chance to make his own memories.