Time zone no problem

The globe-trotting Briton lost a play-off for the World Match Play Championship in Spain before winning the European Tour's PGA Championship in a playoff with fellow Englishman Lee Westwood at Wentworth in England on Sunday.

Five time zones to the west, Donald carded a three-under-par 69 in Friday's second round of the Memorial tournament to end the day four strokes behind pacesetting American Steve Stricker.

"I played a lot of solid golf today," Donald, 33, saidafter posting three birdies in his last five holes at a sun-splashed Muirfield Village Golf Club.

"I've made lots of birdies the last couple days... 12 or 13 birdies probably."

Donald has accumulated 13 birdies, six bogeys and a double-bogey in the first two rounds at the Jack Nicklaus-hosted Memorial event.

"So I'm doing a lot of good things," said the Englishman, who took over at the top of the world rankings for the first time with his playoff victory last week.

"I've made some careless mistakes out there, mostly short game mistakes. This is kind of the first time (in a while) I've played rough that is this long and gnarly and I'm struggling a little bit with it.

"Even yesterday I finished strongly, four birdies out of the last five, and I did something similar today. Obviously a lot of positives and I'm still in a great place for the weekend."

Chicago-based Donald, who plays most of his golf on the PGA Tour, said he was looking forward to taking next week off before competing in the year's second major, the U.S. Open at Congressional.

"This is my fourth week in a row, and certainly I have had to really work on managing my energy levels," he added.

"I haven't probably practised as hard as I would have liked this week, but still, I'm playing nice golf and I'm looking forward to the challenge of another weekend in contention."

Donald, a five-times champion on the European Tour, is bidding for his fourth PGA Tour victory. He clinched the biggest title of his career at the elite WGC-Accenture Match Play Championship in February.