The field of 122 players was competing for seven spots in the final qualifying round, a 36-hole sectional contest on June 3 that will determine the majority of the field for the U.S. Open, beginning June 13 at Merion Golf Club in Ardmore.
Braden Shattuck of Aston, who just completed his freshman year at Delaware, stood at 3-under par through 13 holes but bogeyed four of his last six holes for a 72 that still advanced him to the next stage.
Jeff Osberg of Philadelphia, who has qualified for three of the last four U.S. Amateurs, and former Penn State star Travis Howe of Osceola, Pa., also were at 72, a shot ahead of Philadelphia Country Club assistant pro Mark Summerville.
Chris Gallagher of West Chester, who like Martinson and Howe plays on the eGolf Tour, picked up the seventh and final spot in a seven-man playoff by sinking a 10-foot birdie putt on the first sudden-death hole.
White, who plays out of Manufacturers Golf and Country Club in Oreland, rebounded from three 3-putt greens on the front side with birdies at 10, 11, 12, and 15.
"I couldn't make anything on the front," he said. "But on the back, I started making putts and kind of caught fire and I held it together. It was kind of nerve-racking at the end. I tried not to pay attention to the score, and I tried to put the nerves aside and just play."
Martinson was a first-time visitor to Waynesborough. He wanted to compete in Maryland with his two roommates, but that site was full, and he found the local course appealing because he is attending a friend's bachelor party this weekend in Atlantic City.
The choice worked out.
"I saw the course for the first time" Wednesday, Martinson said. "I've been starting to swing really good, and I just trusted myself. I had a lot of good yardages and hit a lot of really good putts."
Contact Joe Juliano at email@example.com. Follow on Twitter @JoeJulesInq.
Mikel Martinson, Charlotte, N.C. 33-38-71
a-Oliver White, Lower Gwynedd 38-33-71
a-Jeff Osberg, Philadelphia 36-36-72
a-Braden Shattuck, Aston 38-34-72
Travis Howe, Osceola, Pa. 35-37-72
Mark Summerville, Jupiter, Fla. 37-36-73
*-Chris Gallagher, West Chester 37-37-74
*a-Christopher Ault, Yardley 36-38-74
*a-Michael Kania, Haverford 35-39-74
*-Decided in playoff