Lydia Ko turned 18 on Friday during a tournament she would wind up winning -- for a second year in a row. That alone should be enough to amaze golf fans, but with Ko, that's just the start. Here are nine other achievements by the precocious Ko that will blow your mind.
7 -- Career LPGA Tour victories for Ko following her playoff win over Morgan Pressel at the Swinging Skirts LPGA Classic. To put this in perspective, Michelle Wie, 25, only has four.
15 -- Age (15 years and four months) at which Ko became the youngest winner of an LPGA Tour event when she claimed the 2012 Canadian Women's Open. She broke Lexi Thompson's record by 15 months.
17 -- Age when Ko became No. 1 in the world ranking, the youngest male or female to hold the top spot by nearly four years. Tiger Woods (21) previously held the record, and Jiyai Shin (22) was the previous youngest female.
130 -- Weeks Ko already had been ranked the top amateur in the world before turning professional in November 2013 at 16.
29 -- Number of consecutive rounds under par Ko had shot early in the 2015 season, tying Annika Sorenstam's LPGA Tour record.
50 -- Career cuts made by Ko on the LPGA Tour. Why is this so impressive? Because that's also how many LPGA Tour starts she's made as either an amateur or a pro.
58 -- Ko's career percentage of finishing in the top 10 (29 of 50). She's improved that to 88 percent (7 of 8) to start the 2015 season.
69.594 -- Ko's scoring average thus far in 2015, the best on the LPGA Tour.
2,997,843 -- Career earnings by Ko in less than a year and a half. Again, this doesn't count her two wins and other high finishes as an amateur. It also doesn't count the $1 million bonus she pulled in for claiming the first season-long Race to the CME Globe in 2014.