Zach Johnson birdied the par-5 18th hole to grab a one-point lead at the Mitsubishi Electric Classic after Friday's first round at TPC Sugarloaf in Duluth, Ga.

For the first time, the Mitsubishi Electric Classic is using the Modified Stableford scoring system to encourage aggressive play. Rather than scoring relative to par, points are awarded per hole -- minus-1 for a bogey, zero for par and two for birdie. Eagles are worth five points while double bogeys are minus-3.

It is the first time since 2002 that the PGA Tour Champions is using Modified Stableford, according to the tour.