Louis Oosthuizen is leading the field after the third round at the 2012 Deutsche Bank Championship with a three-shot lead over second place Rory McIlroy. Oosthuizen had a huge day on the course to work his way up the leaderboard. He hit 8-under par with a score of 63 on Sunday, which puts him at 19-under for the weekend.

McIlroy is at 16-under for the event and hit 4-under on the day. Tied for third place is Tiger Woods and Dustin Johnson, who are both at 13-under for the weekend.

Keegan Bradley was another player with a big day on the golf course, shooting 8-under on Sunday. His earlier rounds, however, have Bradley sitting at 6-under par for the tournament, far behind those toward the top of the leaderboard.

For more coverage of the Deutsche Bank Championship, be sure to follow SB Nation's Golf hub. A full leaderboard for the event can be found at Golf.com.