– Dark clouds gathered. Thunder rumbled. Lightning flashed on the horizon. Just as unsettling was seeing Dustin Johnson in complete control of his game with a performance worthy of his return to No. 1 in the world.

He was as close to unbeatable as he has ever been.

Johnson capped off his dominant week at The Northern Trust with an 8-under 63 on Sunday, finishing with a tap-in birdie in the dark following a storm delay for an 11-shot victory at the TPC Boston.

It was the largest margin of victory since Phil Mickelson won by 13 at the TPC Sugarloaf in 2006.

“The best I’ve ever seen him look,” said Claude Harmon III, Johnson’s swing coach, as he stood off the 18th green that was partially illuminated by the video board that flashed the scores of the astounding feat.

Johnson hit every green in regulation on Sunday, and he missed only three greens over his last 54 holes. His final 54 holes were rounds of 60-64-63.

Johnson finished at 30-under 254, making him only the third player in PGA Tour history to finish at 30 under or better. He missed the record by 1 shot set by Ernie Els in 2003 at Kapalua. Jordan Spieth also was 30 under at Kapalua in 2016. Johnson at least holds the record on the mainland.