Again, both hit good drives before Keh fired her second to within 4.5m with Ko the same distance from the hole but off the green. Nonplussed, Ko chipped in for birdie. Keh's two putts were enough to secure the victory.
Reflecting on an opportunity lost mainly through some wayward putting - she missed several short putts in coming to grips with a new putter - Ko was gracious in defeat and looks forward to another battle next year when the pair will surely again be the centre of attention.
A year ago Ko shot 67 to win, beating Keh, who finished third, by three strokes.
Keh is no stranger to the big time.
She is a member at Pakuranga and Titirangi, using the former for much of her practice, but now calls Titirangi home. Earlier this year Keh was runner-up to older sister Mun Chin Keh in the NZ Matchplay championship and was a member of last year's victorious Auckland Interprovincial team. She is also in this year's national development squad.
In the boys' championship, Nick Voke (Manurewa High and Manukau GC) shot a three-under 69 to win by three shots from Johnny Tynan (AGS/Titirangi) and Harry Yang (WBHS/Pupuke).
In winning, Voke defended his title to show he is in form as he prepares to head to the United States for some tournaments. He is also in the New Zealand development squad.
Rugby
With an extra week to think about it, round six, to be played on Saturday week, looms large for the contenders in the 1A championship.
In the game of the round unbeaten AGS host Sacred Heart, also with a perfect five-from-five start to their season and a place back solely on the count of bonus points. It will be just as keen over at MAGS when they meet top-of-the-table St Kentigern.
And the classy match-ups do not end there with De La Salle, just a place out of the top four, at home to a King's team smarting from their drubbing by St Kentigern.
Once-mighty King's College were comprehensively outplayed in all departments by a well-drilled, well-organised and clinical St Kentigern XV who won 41-0 after leading 22-0 at halftime.
Supporters of both teams could only be impressed with the home team's play at the breakdown and general physicality around the field, and while King's defended gamely they were no match , especially in the tight five, as St Kentigern scored six tries, converted four and kicked a penalty to ensure a fifth bonus point in as many games this season. King's had a couple of scoring opportunities when St Kentigern were a player down but still could not breach a desperate and tigerish defence. The home side thoroughly deserved their victory and claimed the Don Craig Trophy for the first time in three years.
For King's, fullback Bram Egli was named their player of the day.
The failure to convert any of their three tries cost MAGS and De La Salle victory in a tight game which eventually ended locked at 15-15 after MAGS had led 5-0 at halftime.
The two points they took kept MAGS in the top four and just ahead of De La Salle, who have a game in hand.
MAGS began strongly but it was not until De La Salle had a player in the sin bin that they opened the scoring with some good interchange and support play from Ethan Thompson off George Edwards, who made a telling run down the right flank which led to a try by Thompson out wide.
Trailing 15-10 with five minutes to play, MAGS rallied on the back of an incisive run from Thompson, who then chipped deftly over the opposition fullback for Irae Simone to collect on the full and score out wide.
He failed to convert his own try and the game ended in deadlock.
In girls action, AGGS were the big winners, romping to a 46-0 win over Papakura High at Cox's Bay. Ana Taumalolo led the way, scoring two tries, while Mele Tagi, Piuti Samuelu, Amber Hall, Alice Vailea, Jokaveti Waqanivula and Va'anessa Molia Fraser also dotted down with Molia named player of the day.
North Harbour
Rosmini grabbed the big win in round five of the 1A championship, beating defending champions and previously unbeaten Massey High 34-10.
Rosmini were hungry for the win after losing to WBHS a week earlier.
In the other fixtures TGS beat Mahurangi 36-14, Rangitoto comfortably beat Glenfield 34-3, and WBHS overwhelmed Northcote 94-0. After a break this week, the match of the day on June 9 will be between Massey and WBHS.Bruce Kidd
Waikato
Not seriously challenged in earlier games, Hamilton BHS captured the Chiefs Cup after beating Manurewa High School 32-3 in the competition final, which was played as the curtain-raiser to Friday's Super 15 match at Waikato Stadium.
The knockout format was set up this season to provide early season hit-outs for leading rugby schools in the Chiefs' region. Hamilton Boys' win was based on another good all-round team performance from a school that has used the series well to give its younger squad members plenty of on-field game time.
St Paul's Collegiate were narrowly beaten 15-8 by New Plymouth school Francis Douglas in the opening game of their Central North Island competition.
On the local scene, St Peter's School have taken an early lead after just two rounds in division one of the Waikato 1st XV competition after recording their second straight bonus point win, trouncing Tokoroa 48-0.
In other matches, Cambridge had a good 24-9 win against St John's and Morrinsville shaded Matamata 17-14.
Returning to 1st XV competition after an absence of several seasons, Melville posted an excellent result against St Peter's 2nd XV in division three, winning 45-0.
Soccer
MAGS headed across town for their Battle of Waterloo at Auckland Grammar determined to build on their resounding win over Sacred Heart a week earlier and their unbeaten start to the premier league season.
But, in a game with the Alex Harvey Industries Cup on the line, they came unstuck, sinking to their first loss of the season against an AGS team who sneaked home 2-1 to notch up their first win of the season.
The focus at AGS training leading up to the game was to fortify the defensive frailties. Accordingly, the coaching staff prepared a clear plan for the 1st XI.
As predicted, MAGS dominated the early possession but the AGS XI stuck to their defensive duties perfectly and denied the visitors any clear scoring opportunities.
The home team definitely looked more dangerous at set pieces with Stuart MacKay going close with three headers, and making it fourth time lucky when he headed home for a 35th-minute lead.
A cross by Connor Stoton and a header from Nayuta Nagai gave MAGS the equaliser on the hour, but six minutes from time Kyle Adams drove a pinpoint delivery across the face of goal and Hyungjoo Shin's first-time strike found its mark, much to the delight of the AGS players and their supporters.
In other action, Sacred Heart bounced back from their demoralising loss to MAGS to thrash Rangitoto 6-0. WBHS were even more rampant in seeing off neighbours TGS 9-1, while in a nine-goal thriller, KBHS beat St Kentigern 5-4.
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