Korean-born Kiwi charges at Puerto Rico Open
Danny Lee of New Zealand hits his drive during the third round of the Puerto Rico Open on March 8, 2014 in Rio Grande, Puerto Rico - by Michael Cohen
Hadley shot a bogey-free 67, five-under par, that left the American on 16-under 200 for 54 holes at the $3.5 million (2.5m euros) US PGA Tour event.
But Lee, a South Korean-born Kiwi, charged into contention with a 66 to stand on 201, one stroke ahead of Americans Jonathan Byrd and Jason Gore with Sweden's Carl Pettersson and Americans David Toms and Jerry Kelly on 203.
Lee opened with a birdie, took a bogey at the third and then responded with birdies on the next three holes.
On the back nine, Lee birdied the 13th, took a bogey at the 14th and then again birdied the next three in a row before closing with a par.
Hadley made the most of a strong start, with back-to-back birdies at the par-5 second and par-4 third and again at the par-5 fifth and par-3 sixth.
Hadley finished with 11 pars and a birdie at the par-4 14th.
American James Driscoll, who led after 36 holes when matching his course record with a 63 on Friday, soared to a 75 to share 20th on 207.
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