Thomas Pieters was virtually flawless in the opening round of the WGC-Bridgestone Invitational.
He fired a 5-under 65 to take the early lead.
Russell Knox is in second at 4-under.
Several golfers are tied for third.
Phill Mickelson, and Jason Day are tied with 8 other golfers at 1 over 71 in 33rd place.
Second round coverage will be today in Ohio.
By: Mike Plourde – for Great Lakes Radio Sports