The Masters: Bubba's mammoth drive helps extend final-round lead to 3 over Spieth

Bubba Watson's estimated 366-yard drive on the par-5 13th hole helped set up a birdie that ballooned his tournament lead to three strokes. 

Spieth's drive found the straw to the right, forcing a lay-up on one of Augusta's scoring holes, but he nearly made a birdie of his own after a strong third shot.

Watson is just six holes away from capturing his second green jacket in three years.