Robert MacIntyre fired a bogey-free six-under par 64 to seize a five-stroke lead over top-ranked Scottie Scheffler after Friday's second round of the US PGA Tour BMW Championship.

The 29-year-old Scotsman, who fired a PGA career-low 62 on Thursday as he closed with six straight birdies, birdied six in all for round two to stand on 14-under 126 after 36 holes at Caves Valley in suburban Baltimore.

"Great two days' work," MacIntyre said. "If you leave yourself in the right positions you can be aggressive with the putts... I feel like my iron play has been top drawer this week and just continue to do that."

Scheffler, the season points leader, was next on 131 after a 65 in his PGA-best 13th bogey-free round of the season.

"It was nice to have a clean card today, no bogeys," Scheffler said

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