Bernhard Langer leads The Senior Open at Royal Birkdale Golf Club on Merseyside in England. Bernhard Langer / Getty Images Bernhard had a third round of -4 under par 66, and leapt to the top of the leaderboard on his own at -9 under par, three shots clear of the field. Bernhard, who is shooting for his second Senior Open title, he won in 2010, said that round was probably his best golf; " That was as good as I can play, my ball striking was almost perfect and I played really well, apart from the mistake at the 14th. It’s always special to win any tournament, but to win a Major and to win it on a golf course like this, would mean a lot. There's a lot of golf left, we all know that. There’s somebody inside me that expects me to win, but I know there's 18 holes left, and there's a lot of shots to be pulled off and a lot of putts to be made. So golf is not over till it's over, and we've got 18 holes to play. I've hit so many good shots the last few days where they just feel good and come off right where I want them to go, and they go the proper distance. It's just fun playing golf that way because it doesn't happen very often.” David Frost is in second place with a total of -6 under par with a modest third round of -2 under par 68, and will start the final round three shots in arrears of the leader. David admitted it would take something really special to him to win his maiden Senior Open; “I have to do something really special, I have to find something that I'm confident with, that I can go out tomorrow and just find a little key thought. It would be special to win here at Birkdale. I've come here many years, so hopefully we can talk about that tomorrow night.” Overnight co-leader Mark Wiebe needed a 40-foot birdie putt at the 13th to return to level par for the day and finished four shots off the lead, in third place on his own at -5 under par. Sandy Lyle, the 1985 Open Champion is still in the hunt, albeit six shots off the lead at -3 under par for the tournament. Sandy was joined on that score by Gene Sauers and Peter Fowler.