Lydia Ko could afford a few smiles during the final round of Fubon LPGA Taiwan Championship in Taipei. She won the tournament and will regain the No 1 world ranking.

Lydia Ko woke up in Taiwan on Sunday and immediately scrambled to find out the All Blacks' Rugby World Cup semifinal result in true teenage fashion, by jumping on Twitter.

She then channelled the positive vibes created by New Zealand's 20-18 win over the Springboks to run away with the Fubon LPGA Taiwan Championship in Taipei, reclaiming the world No 1 women's golf ranking with a Sunday exhibition.

In a truly dominant display, not unlike those often showcased by the All Blacks, Ko was all class in the final round as she turned a four-shot overnight lead into a whopping nine-shot victory at the Miramar Golf and Country Club.

Thananuwat Srirasant Lydia Ko hits a drive during the final round of Fubon LPGA Taiwan Championship in Taipei.

She closed with a seven-under 65 to finish at 20-under par, with two former major champions from South Korea - Eun-Hee Ji and So Yeon Ryu - trailing in her wake back in a tie for second at 11-under.

Ko pockets a winner's cheque for the fifth time on the LPGA Tour this year - this time $US300,000 - and overtakes South Korea's Inbee Park at the top of the world rankings. The Kiwi needed to win or finish second in Taiwan to leap past Park, irrespective of what the latter did at the Korean tour event she is playing this week.

"I have played consistently well over the last couple of weeks and it's something we can all celebrate and I want to share this with my whole team," Ko said immediately after the win.

Thananuwat Srirasant Lydia Ko lines up a putt during the final round of Fubon LPGA Taiwan Championship in Taipei.

"It's always great when your family is part of the win and here to celebrate a win with you."

It will be Ko's second stint as world No 1 - she took over from Park and held the top spot for 19 weeks from February 2 to June 8 till Park snaffled that honour back from her.

It comes as no surprise given her form. Ko is clearly the hottest player in the world right now and in the midst of some astonishing form; she has three wins, including a major, and eight top-four finishes from her last nine starts.

Thananuwat Srirasant Lydia Ko signs autographs for fans during the third round of the Fubon LPGA Taiwan Championship in Taipei.

She said before the final round she would rather win this week than worry about rankings, but she'll have her cake and eat it too after becoming the youngest player in LPGA Tour history to reach 10 career victories, a record formerly held by Nancy Lopez at 22 years, 2 months, 5 days. Ko is 18 years, 6 months, and 1 day old.

"I actually met her (Lopez) in Cleveland a couple of months ago, she's such an amazing person and amazing golfer so to have beaten her record, it's an honour," Ko said.

She's now won five times on the LPGA Tour in 2015, and six worldwide if you count the New Zealand Women's Open, a Ladies European Tour event. No wonder she is leading all the major categories nearing the business end of the season, including the Race to the CME Globe standings, official prizemoney ($US2.72 million), scoring average, and Rolex Player of the Year points.

The New Zealander started the final round of the latest LPGA Tour event with a four-shot lead, easily the biggest 54-hole lead of her career, and only built on that on Sunday.

Ko made an incredibly hot start, with birdies at the par-five second, par-three third, par-four fifth and par-five sixth to open up a six-shot lead. That was cut to five when Ko made bogey at the par-three seventh, missing the green and chopping out of the long rough before missing the six-footer for par.

It was the only blemish on an exceptional round, Ko making the turn in three-under 33 then sealing the win when she holed a wedge shot from 40m for eagle at the par-five 12th, the shot of the day.

The lead went from seven to eight when the Kiwi stuffed her tee-shot at the par-three 14th to three feet and, clearly not content to just par her way home, birdie No 25 for the week followed at the par-five 18th.

When Ko first become world No 1, she finished tied for second at the Coates Golf Championship in Florida in February, after blowing a final round lead. That's why she desperately wanted to regain top spot with a win on Sunday.

"To me, obviously I was happy that I became world No 1 and I was going to become world No 1, but it did sting a little bit with the way I finished the last couple holes. And it wasn't the finish I was expecting," Ko said before the final round.

Interestingly, this week marks the eighth time in her career that Ko has led or co-led heading into the final round. She now has a four-from-eight conversion rate.

Also, this is the first time Ko has entered the final round of an LPGA Tour event with a lead of more than one shot. Prior to this week, three of her seven 54-hole leads had been by one shot and the other four were co-leads.

LYDIA KO'S RECORD WITH THIRD ROUND LEAD IN LPGA TOUR EVENTS (event, margin after 54 holes, result)

2015 Fubon LPGA Championship Taiwan - 4 shots - Win

2015 KEB HanaBank Championship - Share - T4

2015 Canadian Open - Share - Win

2015 Australian Open - Share - Win

2015 Coates Golf Championship - 1 shot - T2

2014 JTBC Founders Cup - 1 shot - T2

2013 Australian Open - Share - 3rd

2012 Canadian Open - 1 shot - Win

KO'S 10 LPGA TOUR WINS BY YEAR

2012 (amateur) - 1

2013 (amateur) - 1

2014 (pro) - 3

2015 (pro) - 5