Christchurch: American Nicholas Thompson beat Canada's David Morland IV on the first hole of a sudden-death playoff on Sunday to win the New Zealand PGA golf championship.Both players shot four-under-par final rounds of 68 to be tied at 280, eight-under-par, after 72 holes at the Clearwater Resort course. Thompson made par on the first playoff hole while Morland made bogey out of a greenside bunker, giving the American his first win on the Nationwide Tour."I just played the playoff hole like any other hole," Thompson said. "All day I just tried to make shot shots and solid swings. I swung it good all day, especially on the last nine and I had chances all day."Thompson and Morland started the day tied for third place at four-under-par, two strokes off the lead.Crucial leadBoth watched as American Michael Letzig took the early clubhouse lead on Sunday at seven-under, then as Lee Williamson of the United States assumed the lead at eight under with a birdie on the 15th.Williamson was still leading at the 17th, with Morland and Ryan Howison tied one stroke behind at seven-under. The hole proved crucial in determining the fortunes of the tournament frontrunners.Morland birdied to reach eight-under, while Williamson bogeyed to fall back to seven-under and Howison, who led the tournament after the first and third rounds, also bogeyed to drop to six-under as his final round unraveled.Morland parred the last and had to wait while Thompson, in the final group on the course, challenged his lead.Thompson made birdie on 17 to drop to seven under, then made one of only four final round birdies at 18 to tie Morland and force the playoff.Both players drove down the left side of the fairway at the par four playoff hole, the 18th, but Morland's approach went right and landed in a shallow greenside bunker while Thompson found the middle of the green.