Thomas Pieters leads WGC-Bridgestone as Rory McIlroy and Jordan Spieth start well

Pieters ended the round with a one-shot lead on five under after a bogey-free 65 despite finding only five of 14 fairways, while Russell Knox is alone in second with McIlroy, Open champion Jordan Spieth and rising star Jon Rahm among the group on three under in a congested leaderboard at Firestone Country Club.Defending champion Dustin Johnson and world No 2 Hideki Matsuyama also fired sub-70 rounds, but Masters champion Sergio Garcia and runner-up Justin Rose both have ground to make up on the leaders as they struggled to a pair of 72s.