HUIXQUILUCAN, Mexico (AP) – Graham Marsh of Australia shot a 6-under 66 Saturday to take a one-stroke lead after two rounds of the MasterCard Classic.

The 60-year-old Marsh had five birdies on the front nine and two birdies and a bogey on the back to move to 8-under 136, one stroke ahead of Hugh Baiocchi of South Africa.

“I stayed out of trouble,” Marsh said. “With this golf course, if you stray it’s not a bogey, it’s a double or triple bogey.”

Baiocchi birdied the 18th to finish with a 66.

“It was a case of making some good puts and not wasting opportunities,” he said. “I was hitting all the fairways and greens and wasn’t struggling.”

Baiocchi said he would have to perform well Sunday to overtake Marsh.

“It’ll be hard to beat him because he’s not going to beat himself,” Baiocchi said. “If I shoot another 6-under 66, I’ve got a good chance.”

Jay Sigel had seven birdies, but made double bogey at 14th and finished at 3-under 69.

He was two strokes behind the leader at 6 under.

Tom Kite (68) and Jim Ahearn (70) were tied for fourth at 140, and Hale Irwin was another stroke back after a 71.

The Bosque Real Country Club course, which is 8,100 feet above sea level, is playing about 200 yards longer than last year, and the pros say it is playing tougher.

“Adjusting is difficult,” Baiocchi said. “At this altitude it’s always a bit of a guessing game.”

First-round leader Andy Bean had a double bogey and two bogeys Saturday, following an opening 67 with a 2-over 74.

Only 15 of 78 players beat par in the second round, compared to 32 last year.