Karrie Webb four off pace Karrie Webb hits her tee shot on the eighth hole during the first round of the Kraft Nabisco Championship Source: Getty Images KARRIE Webb has made a solid start in her quest for an eighth golf major, carding an even-par 72 to be four strokes off the pace at the the Kraft Nabisco Championship The Australian trails playing partners Suzann Pettersen and Na Yeon Choi, who took advantage of perfect morning conditions to share the first-round lead with Jodi Ewart Shadoff at Mission Hills in the Rancho Mirage, California. Finishing before the temperatures climbed, Pettersen and Choi had bogey-free rounds of four-under 68. Ewart Shadoff matched them late in the afternoon in more difficult conditions. Pettersen birdied the final three holes on her front nine and got to four-under with a birdie on the par-4 seventh, her 16th hole. The Norwegian, a 10-time LPGA Tour winner ranked eighth in the world, had consecutive victories late last season in South Korea and Taiwan and won a European tour event last month in China. The third-ranked Choi fed off the pairing with Pettersen, making a 30-foot birdie putt on the par-3 14th, matching Pettersen's birdies on 16 and 17 and grabbing a share of the lead with a 12-foot birdie putt on the par-5 ninth. Ewart Shadoff, playing in the last group of the day off first tee, made four straight birdies - the last with a 20-foot putt on the No.14 - to take the lead at five-under. She missed a four-foot par putt on the par-4 16th to drop back and scrambled to save par on the par-5 18th after her drive found the deep right rough. Anna Nordqvist and Amy Yang were a stroke back at 69. Top-ranked Stacy Lewis had a 73 after taking a triple-bogey 6 on the 14th, three-putting after her tee shot trickled into the water. Lewis won the 2011 Kraft Nabisco Championship for her first LPGA Tour title. She also won four times last season to take the player of the year award and added consecutive titles this year in Singapore and Phoenix. Michelle Wie and 15-year-old amateur star Lydia Ko each shot 72 in their morning pairing. "It was fun," Ko said. She's my idol, so I was very excited. Ko won the Canadian Women's Open last August to become the youngest LPGA Tour winner. The South Korea-born New Zealander has two other victories in pro events, winning the New South Wales Open last year and the New Zealand Women's Open this year. Yani Tseng, playing for the first time since losing the No.1 ranking to Lewis in Phoenix, also opened with a 72, while defending champion Sun Young Yoo of South Korea had a 77.