Graeme McDowell carded an impressive six-under-par round of 65 to boost his hopes of making the cut in the defence of his PGA Tour title in Mexico.
After an opening day 75, McDowell hit eight birdies and two bogeys in a much-improved second round.
The Portrush golfer got early momentum into his round firing five birdies in the first eight holes. He finished on the projected cut mark of two under, eleven shots behind leader Gary Woodland of America.
Defending champion McDowell bogeyed the sixth and 12th holes in Playa del Carmen, but rallied with further birdies on the par five 13th and had a two at the par three 15th to move to one under par after 15 holes.
Needing to pick up one more shot to move inside the cut mark, he birdied the 17th to sign for a 65.
Sweden's Alex Noren is in pole position to claim a fourth European Tour title of the season after the second day of the Nedbank Golf Challenge.
Noren carded a second round of 67 at Sun City to reach the halfway stage on eight under par, two shots clear of England's Chris Wood, Paraguay's Fabrizio Zanotti and home favourites George Coetzee, Louis Oosthuizen and Jaco van Zyl.