On an injured day Jason Day went up to a part of Masters' lead in the middle of the second round only one day after fighting paralytic back pain at Augusta National.
The Australian, who received a medical treatment on the side of the second hole on Thursday, came out firing on Friday with a five-under-67 par 67 that sent him to seven low.
The first world number one is added to the participation of the Open Open winner, Francesco Molinari, who agreed with the day of 67.
The night leader, Brooks Koepka, had a disastrous start for his second round, but recovered in the last nine years with two birds in his last four holes to join Day and Molinari at seven years.
Australian Adam Scott also enjoyed a quick start of his second round with three paxariños to raise six under, just a blow behind the main trio.
Dustin Johnson and Justin Harding are also six years old.
Day closed her round with three birdies in the last six holes. The best Australian final of 31 years at the Masters was when he tied the second in 2011. This is his ninth appearance at Augusta National.
Day was revealed after his second round he was struggling with problems related to his ribs without being online.
He said he was fluttering balloons after each round in an attempt to make his bony structure align.
"I've been fighting the issues almost every year," he said.
"Have to play four followed. He started in Bay Hill, epidurals and shots in the back and last week I had another before the start of the tournament. It felt so much better.
"I was very worried about it, but what caused me more was a balance of couples, not necessarily the own shots. I have a fake and a spit tonight and this morning. I know the protocol."
Molinari played a second-round Friday with no bogey-free, with three birdies on the front nine and two more on the back.
The 36-year-old is trying his second major championship after winning the British Open last year.
Koepka, the leader of the night in the morning, found some early problems.
Koepka paxariño made his first hole but then made the double bogey at number 2 after picking up the car on the trees and having to make a drop.
Phil Mickelson has two shots around 5 years after a bird in number 2.
The golf world was stunned at the remarkable rematch of the day of its back complaint.
– With AP, AFP