Also present this week is world number six Retief Goosen, the 2003 Chrysler champion.
Victory over Kelly would bring Casey a quarter-final against Retief Goosen or US Open champion Angel Cabrera.
Defending champion Retief Goosen withdrew from the tournament on Wednesday because of an eye complaint following recent laser surgery.
Graeme McDowell posted five birdies in a bogey-free 67 to tie for third place with Retief Goosen on 14 under.
Retief Goosen shot a best-of-the-week 64 to move up to a tie for third with Graeme McDowell, who closed with a 67.
And there will be 11 major winners in the field, including current Masters champion Angel Cabrera, Ernie Els, Trevor Immelman and Retief Goosen.
None of the nine leading players has won a major title, with two-time US Open champion Retief Goosen the most decorated of the contenders at five under.
The 2010 British Open champion won by two shots from Tjaart Van der Walt with another South African Retief Goosen in third place, a further shot behind.
Englishman Lee Westwood was tied for fourth with South Africa's Retief Goosen on two-under after they shot 70 and 71 respectively on the testing, 7, 204-yard links course.
But it was better day for fellow contender Retief Goosen, who hit seven birdies and three bogies on his way to 68 and a four-way share of fourth on nine-under.
But Phil Mickelson rounded off a dominant performance by the Americans in the final match on course as he dispatched Retief Goosen 2 and 1 with a birdie on the 17th.
The veteran shot five birdies and three bogeys to lay alongside England's Paul Casey, while Spain's Miguel Angel Jimenez and Retief Goosen of South Africa are well placed on three under.
Many pundits are also tipping Sweden's Henrik Stenson, the world number eight, South Africa's two-time US Open champion Retief Goosen and compatriot Ernie Els, both twice Masters runners-up, as lively challengers.
Paul Casey, David Howell, Retief Goosen and Bradley Dredge are among those one further back, but Colin Montgomerie is down on three under and in danger of being an also-ran yet again.
Pebble Beach National Pro-Am, for example, TaylorMade players such as Dustin Johnson, Retief Goosen and Robert Garrigus will be wearing high-visibility yellow bucket hats, at least part of the time, to promote the company's latest RocketBladez irons.
WSJ: How TaylorMade Made Its Move | Golf Journal by John Paul Newport
Pebble Beach National Pro-Am, for example, TaylorMade players such as Dustin Johnson, Retief Goosen and Robert Garrigus will be wearing high-visibility yellow bucket hats, at least part of the time, to promote the company's latest RocketBalz irons.
WSJ: How TaylorMade Made Its Move | Golf Journal by John Paul Newport
Elsewhere, Phil Mickelson and Justin Leonard beat South African Retief Goosen and Australian Adam Scott 3 and 2, while Zach Johnson and Hunter Mahan carded a 2 and 1 victory over Australian Robert Allenby and Colombia's Camilo Villegas.
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