Back at Clearwater last weekend to claim her second NZ Open title, Ko showed her full range of skills around the track and in dealing with the many duties off the course.
It's astonishing to think Ko is 17. She deals to the public parts of her work with the aplomb of someone a decade older.
Her ability to cope with everything around her, to engage yet filter all those details and set about delivering excellence inside the ropes points to her self-belief.
She has sorted the foundations to her game, so she knows what works for her and brings that belief to work.
She has a remarkable temperament that scarcely wavers. There might be a flicker of the eyes which are now assisted by contact lenses or a slight crease of the forehead but little to suggest anything will divert her concentration.
Even when someone in the crowd at Clearwater snapped Ko's photo as she was about to tee off in the last round, she backed away quietly as her Australian caddy Jason Hamilton asked the gallery for quiet.
Ko stepped up again and knocked her drive down the middle.
When the final group arrived on that tee the chat turned to the previous evening's food and entertainment. Charley Hull had enjoyed her range of tepanyaki, and Ko had been to dinner at Sir Bob Charles' house where they watched the World Cup cricket.
Then came the gentle barb as Ko asked Hamilton about that result as she delightedly high-fived her caddy about NZ's one-wicket victory.
Maybe the teenager was still caught up in those memories as she had to get a wriggle on when she was called to begin her final round.
She grabbed her pink-shafted driver from the bag, pulled her glove on and dropped her Callaway 3 onto the tee peg. Hamilton checked her lineup and gave his approval before the intrusive smart-camera interrupted the routine.
It was annoying but players know those intrusions will occur especially when galleries get a chance to see a world No 1 up close. In three days the crowds at Clearwater massed almost 15,919 and most of those tracked Ko.
She was the only show in town and confirmed that class, shooting 70, 61, 71 to win by four shots from Australian amateur Hannah Green.
She had one eagle, 18 birdies, four bogeys and a double bogey in her three days' work, the double and two bogeys coming in her final round.
Ko brings a wisdom about her game which is compelling. She has great "feel" with an ability to move the ball in both directions and the soft touch and vision to deliver killer touches inside 100m.
There is not a big "wow" factor about her game, but the commitment to excellence is enduring as she pulls into her world inside the ropes.
Ko added the US$35,500 winner's purse to the almost US$350,000 she has won since late January. She is playing in Singapore this weekend, and the first of the majors, the ANA, is next month in California.
Commentators are saying her No 1 status will not be complete until she wins a major, and Ko accepts that measurement as one of the standards in her profession.
She is ruling the rankings and with that sort of form, the big one does not seem too far away. If it happens, it will not be a surprise.
