New British Open champion Louis Oosthuizen sits at the top of the leaderboard after the first round of the Scandinavian Masters, alongside Australia's Richard Green and Dustin Johnson of the United States, after shooting a 5-under 67 Thursday. Just four days after his runaway victory at St. Andrews, Oosthuizen started full of confidence on an overcast, breezy day at the Bro Hof Slott course with a birdie at the par-5 578-yard first hole. The South African finished the front 9 in 1-under 35. He collected five more birdies on the back 9, but was unable to take the overall lead after a bogey at the 13th. “I had a good sleep, but I woke up tired again and the (British Open) win has definitely drained me,” Oosthuizen said. “But the crowds were unbelievable, cheering me on to every green and every tee. I wanted to play nicely. The last thing I wanted was to put on a bad show.” “I need a break. I need a week off before going to America,” Oosthuizen added. “I don't think I'm (supposed to be) back to South Africa until September but I felt like I wanted to say hi to my family and see everyone before I go.” Green reached his 67 after posting three consecutive birdies from the 11th. The Australian is going for his first European Tour win since 2007. “My driving was exceptionally good,” Green said. “(This year) I've struggled with the putter, I've struggled with my driving. Hopefully those two areas can stay with me this week.” Johnson, who finished 8th at the US Open in June, completed the back 9 in 33 after birdies at 12, 13 and 18. Scottish Open champion Edoardo Molinari was one shot back after a 4-under 68. The Italian chipped in from the bunker for a birdie at No. 7 after a poor drive. “The tee shot was a shank to be honest,” Molinari said. “I think I hit a very good bunker shot because it came out very high and soft and then hit the flag and went in.” It was a mixed day for the Swedish players in front of their home crowd. Steven Jeppesen shot a 68. Two-time champion Jesper Parnevik was 3-over in his first competition since February, while Robert Karlsson shot a 1-over 73 after a double-bogey at the first hole. Ricardo Gonzalez of Argentina has work to do to come back and defend his title after shooting a 72, putting him five shots off the lead. Langer shares lead Two-time Masters champion Bernhard Langer, who has yet to clinch a Senior title, grabbed a share of the early first round lead with a four-under par 67 at the Senior Open in Scotland Thursday. The German was joined in the clubhouse lead by America's Jay Don Blake. “I'm very happy with it,” said Langer, a former Ryder Cup captain. “I birdied the very first hole and had some further chances the next few holes, then had a nice run there on seven, eight, nine when I birdied those three – there's a lot of tough holes on the back nine.” Langer, trying to win a first over-50 Major category title, enjoyed a birdie at the first hole and then a hat trick from the seventh to turn in a four under par 32. He then went level par 35 on the way home. “I played very well. I kept the ball in play, I drove it pretty good and hit a number of fairways,” he said. Blake turned in 35 before recording three birdies in four holes from the tenth. “I hit a lot of good shots,” said Blake, whose only US PGA Tour victory came 19 years ago. “I just tried to be patient. It's a golf course that you can't be aggressive because everything runs up to the pin so much that you can't fly it to the flags like we are used to over in the courses we play in America.”