By Brian Wacker, PGATOUR.COM
Dustin Johnson withdrew from the HP Byron Nelson Championship on Tuesday, citing a bad back.
It marks the third straight week Johnson has missed because of injury.
Johnson withdrew from the Wells Fargo Championship because of inflammation in his left wrist. After an opening-round 74 at last week's PLAYERS Championship, Johnson withdrew, citing an injury to his lower back.
Tuesday, Johnson said via his Twitter account, "Tried to go but have inflammation in my facet joints. Some rest and daily therapy with my physical therapist, then I should be good!!"
Johnson opened the year with a victory in Maui. He pulled out of the following week's event on Oahu after the first round with the flu. He had recorded three straight top-15 finishes before pulling out at Quail Hollow.
Earlier Tuesday, Bob Estes also withdrew from the HP Byron Nelson Championship.