Lorena Ochoa will try to stretch her streak of major victories to three this week when the LPGA Championship tees off at Bulle Rock.

The world number one from Mexico has won six titles this year, including the first women's major of 2008 the Kraft Nabisco Championship at Rancho Mirage in March.

That followed her triumph in the women's British Open last August at St. Andrews, where she claimed the first major title of her career.

"I believe it is possible to win all four majors in one year," said Ochoa, who will be up against some determined competition in defending champion Suzann Pettersen of Norway and former world number one Annika Sorenstam.

Sorenstam, who has said she will retire at the end of the year, would surely like nothing better than to add to her 10 major titles before then.

The Swedish superstar won the LPGA Championship crown three times in a row from 2002, her most recent victory coming after the tournament moved to the current venue at Bulle Rock.

"Winning another major would be a perfect way to end my career," said the 37-year-old Swede, who has three wins this season.

"Obviously, I've got some great memories from this course, and my game's in good shape."

However, Sorenstam said she couldn't afford to dwell on the fact that this will be her final LPGA Championship challenge.

""My focus is to play well and I want to do the best I can," she said. "I try not to think that this is my last LPGA Championship.

"If I start thinking like that, I think it would be very tough. I mean, the pressure would be there."

Pettersen won her first major championship a year ago when she edged out Karrie Webb by one stroke. It was the second year in a row Webb, the 2001 champion, settled for a runner-up finish at the season's second major.

"It's of course a great feeling coming back here," Pettersen said. "I had a really nice win here last year, and it's just one of those courses where you always feel good coming back to."

Ochoa should have plenty of reasons to feel good these days no matter where she plays.

No doubt she is keen to beef up her resume where the LPGA Championship is concerned, with her best finish a tie for fifth, six strokes behind Sorenstam, in 2005.

But Ochoa's build-up has been far from ideal. She skipped the Ginn Tribute in South Carolina to be with her ailing uncle, who died in Mexico last week.

Ochoa insists she is now ready to put aside her family concerns and play.

"I am back and I'm very motivated," Ochoa said. "I really want to play good. It's going to be a good challenge for a major championship, and that's the way it should be."

Seon Hwa Lee, who became the first South Korean to win on the US women's tour this year with her charging victory at the Ginn Tribute last week, admitted that she was feeling a little more fatigued than fired up heading into the first major of the year.

"I'm really tired now, and the golf course is really long now because yesterday there was lots of rain and the fairways are really wet," she said, adding her game plan would be to "just hit it straight and make a lot of putts... if I think play like that, I'll be all right."

Lee was paired with Sorenstam, the host of the Ginn Tribute, for the first and second rounds, a group she was looking forward to.

"I feel good playing with Annika, I played with her the last few years. She gave me the trophy last week, so tomorrow will be really exciting and the next two days."