Lydia Ko has finished strongly at the Lotte Championship on the LPGA Tour to claim her best result in nine months.

Ko shot an eight-under 64 to finish in second, after a superb final three days of the tournament.

The 19-year-old world No 1 was in danger of missing the cut, after a first round one-over 73, but followed up with rounds of 69, 65 and 64 to storm up the leaderboard, finishing at 17-under par.

It is Ko's best finish, since winning the Marathon Classic last July, but carding the best round of the day wasn't enough to catch runaway leader Cristie Kerr. The American backed up her third-round 62 with a final-round 66 to claim a three-shot victory.

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Once again, Ko's putting proved to be a vital factor. Having struggled with the putter earlier in the year, Ko required a mere 22 putts in the final round, being especially potent on the back nine.

After a birdie at the first, Ko stagnated early on the front nine, carding her first bogey in 44 holes on the second, before holing four straight pars. However, she caught fire at the turn, reeling off four straight birdies and adding a further four on the run home to continue her rise up the leaderboard.

"It's a big confidence booster," said Ko. "I've been playing pretty solid - didn't have the greatest week at the Kia Classic, but then played pretty decent at the first Major of the year.

"With the winds not being as high and strong compared to the other days, I knew that the birdies were out there."

"Considering where I was after the first day, I'm pretty pleased with where I finished at the end of the week."

The strong finish clinched Ko's fourth top-10 placing in her seventh event of the year and her first top-five finish in 13 events, as she steadily begins to find her best form.

Ko's rivals for the world number one ranking - So Yeon Ryu and Ariya Jutanugarn - finished in sixth and seventh respectively.

* Danny Lee slid backwards at the RBC Heritage event on the PGA Tour, shooting a two-over 73 to drop 28 spots to a share of 53rd at two-under. Jason Dufner leads the tournament at 13-under.