D. Johnson cruises to 3-shot win at BMW

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After overpowering Crooked Stick for four straight days, Dustin Johnson has his third win of the season. Here's how things ended up at the BMW Championship, where Johnson cruised to a three-shot victory:

Leaderboard: Dustin Johnson (-23), Paul Casey (-20), Roberto Castro (-17), Adam Scott (-12), Matt Kuchar (-12), Charl Schwartzel (-12), Ryan Palmer (-12)

What it means: Johnson opened the day with a three-shot lead, but two bogeys over his first three holes allowed Casey to catch up. Johnson reeled off four birdies in the next five holes to regain his advantage, then closed things out with an eagle on No. 15. This is Johnson's third title of the year, likely inching him closer to Player of the Year honors, while Casey was a runner-up for the second straight week, and Castro's finish was enough to get him back to East Lake.

Round of the day: A back-nine rally earned Schwartzel a trip to the season's final event. The South African entered the week at No. 43, but after an 8-under 64 he snuck in as the final player in the 30-man field by less than a point over Rickie Fowler. A winner earlier this year in Tampa, Schwartzel made the turn in 3-under 33 before reeling off five birdies in a seven-hole stretch from Nos. 11-17.

Best of the rest: It wasn't the lowest score, but Castro's 5-under 67 made the biggest difference since it clinched his spot at the Tour Championship. Castro quickly shook off a third-round 74 by making the turn in 32, and after starting the week at No. 53, he heads to Atlanta No. 21 in the FedEx Cup race. One year after reclaiming his card at the Web.com Tour Finals, Castro will play just a few miles down the road from his alma mater, Georgia Tech, in two weeks.

Biggest disappointment: World No. 1 Jason Day withdrew after just eight holes of the final round and his status for the Tour Championship is officially in doubt. Day has a long history of battling both injury and illness, and his agent indicated that the Aussie is now dealing with a pinched joint capsule in his lower back that is causing muscle spasms.

Shot of the day: After Casey rolled in a 25-foot eagle putt on No. 15, Johnson stepped up and coolly made an 18-foot eagle putt of his own. The response maintained his three-shot lead and allowed Johnson a stress-free walk over the final three holes.

Quote of the day: "I've got a lot of confidence in every part of my game, especially all the work I've put into my wedges, it's really paid off this year. This week, the putter really worked." - Johnson, who put a new putter into play for Thursday's opening round.