Rain leaves Brooks Koepka to lead marathon Masters finale on Sunday

• Koepka four ahead of Jon Rahm but completes only six holes
• Leader says he's not too concerned about playing 29 holes'

Mother Nature has been unable to stall Brooks Koepka. Next, a test of endurance. If the 32-year-old is to don a Green Jacket for the first time, he will have to survive a marathon Sunday at Augusta National after play was stopped shortly after 3pm on day three because of flooded putting surfaces. Koepka, who will resume on the 7th green of his third round, leads Jon Rahm by four. Thirteen under plays nine under. With a further three strokes to the outstanding amateur Sam Bennett, this has the hallmarks of a two-horse race. Koepka is firmly of a mind to halve the number of runners. His mojo has returned.

I'm not too concerned about playing 29 holes or however many holes we've got left," Koepka said. It's part of the deal. I'm pretty sure I'll be up for it considering it is the Masters. So I don't think anybody should have a problem with that.