Going into the final day of the Thornberry Creek LPGA Classic, the South Korean already held an eight-shot lead and went on to close with a seven-under 65 round on Sunday, putting her on 31-under 257 overall.
Kim actually has a 27 under par total for 72 holes which she recorded when winning the JTBC Founders Cup in 2016.
Kim carded a second-round 65, which included a double-bogey on the par-three 17th, to be 16 under.
"Just before I started (the final round), I setting my goal of a bogey-free round", she said afterwards. "So I had a lot of birdie opportunities and I putted really well today".
"Yeah, I'm very happy".
Kim began the final round with an eight-shot lead and played magnificent golf all day.
The steady Yang had five birdies without a bogey and was one stroke in front of former world number one Lydia Ko, Sweden's Anna Nordqvist and American Emma Talley. "Then I set my goals, just kept relaxed - except the last three holes I couldn't control the nerves because it was nearly done, but I finished really good".
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Her 32 holes of birdie or better were yet another record - improving on the 30 sub-par holes in a tournament achieved previously by three players.
BC-GLF-LPGA Tour, 3rd Ld-Writethru, 433Sei Young Kim sets 54-hole mark at 24 under at LPGA ClassicAP Photo WIAPP323, WIAPP325, WIAPP322, WIAPP326, WIAPP328, WIAPP327, WIAPP330Eds: Clarifies that Kim shares 72-hole record with Sorenstam.
DONEGAL, Ireland (AP) - Russell Knox of Scotland holed almost identical putts of 40 feet on the 18th hole, first to get into a playoff, and then to beat Ryan Fox and win the Irish Open for his first European Tour victory.
Kim is the 17th different player to win during the 2018 season and is the sixth player from Korea to win.
She was ranked as high as number eight in the world previous year after her win in Mexico and has struggled for much of 2018. After that, I wanted to - really wanted (the LPGA) record. "When someone plays that good, she deserves to win".
Torres made seven birdies against just one bogey for her 66 on Sunday. "Even if I break it, I'll keep (making) the challenges higher".
Kim won for the first time this year and joined Brooke Henderson as the only players on the LPGA Tour with at least one victory in each of the last four seasons.