Justin Thomas followed up his sizzling 61 with a two-under par 69 on Friday that was good enough to keep him two shots clear atop the leaderboard at the US PGA Tour's RBC Heritage.

Relegation-threatened Cape Town City, runners-up in the South African Premiership three seasons ago, plunged deeper into trouble on Friday after losing 1-0 away to Richards Bay in Durban.

Lando Norris drew a line in the sand after his trying time in Bahrain last weekend and bossed a second practice at the Saudi Arabian Grand Prix marred by a crash for Red Bull's Yuki Tsunoda.