Robert MacIntyre used a red-hot putter to birdie the last six holes and surge to a three-shot lead over Tommy Fleetwood in the US PGA Tour BMW Championship in Maryland on Thursday.

McIntyre delivered a masterclass on the rain-soaked greens at Caves Valley after an afternoon thunderstorm halted play for more than two hours.

"The last six holes is probably as good as I've ever putted in a stretch of holes, just so consistent," MacIntyre said after posting an eight-under par 62.

"When you get the eye on, it's free flowing and it's nice."

His late burst carried him past world number one Scottie Scheffler -- who was in the clubhouse on four-under 66 and ended the day alone in third.

Fleetwood overtook him with a 33-foot birdie at 18 to cap a 65.

Two-under after his second bogey of the day

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