"When Ariya won the British Open at Woburn previous year, I finished not long before her and dashed out to watch her play the last few holes", recalled the big sister.
The 23-year-old blotted her card again at the second, but she responded with further birdies and the third and sixth although she was unable to take advantage of the remaining two par-fives as she set the early clubhouse target at nine under par.
The 2009 LPGA Championship victor, who battled glandular fever (mononucleosis) this summer, outlasted third-year-pro Altomare under borderline-unplayable conditions similar to those on Thursday that forced the LPGA to reduce the tourney to 54 holes.
Uehara, a three-time victor in Japan, fired a 66 for eight-under with Australian Katherine Kirk, runner-up in the 2010 Women's British Open, in third on seven-under after a 69.
She won the title in 2009 and 2011 - it became a major in 2013. She was 6 over through five holes in wind and rain Thursday when play was scrubbed. "It was very stressful and I was nervous and excited".
"But I reckon if I keep knocking on the door, one day it will be my turn", she said. Everything is a learning experience.
"My aim is to win my first tournament, but I don't want to put pressure on myself. I thought it was just for second", said Altomare.
The only sisters to have won on the LPGA Tour are Annika and Charlotta Sorenstam. Annika won 72 times, and Charlotta won once - at the 2000 Standard Register Ping in Arizona.
Altomare has been on an upswing since starting the 2016 season ranked No. 566 in the world.
Kirk turned a long run of disappointment around this year with a win in Wisconsin her first since 2010 and talked about just what that win meant to her.
"The win this season was a huge confidence boost", admitted the veteran. "But it's been 2 1/2 months now, and I still - I'm getting a lot better, so that's all I'm trying to focus on now, and hopefully in a few more weeks, I'll be fully recovered". "I didn't get off to the best start, even though I felt like I was hitting it pretty good".
The Queenslander shared the lead at Evians Les Bains with four other women with just three holes to go after superb birdies at the 14 and 15.
Overnight leader Moriya Jutanugarn of Thailand had a hard day and missed her spot in the final playoff when she bogeyed on the last hole to end up tied for third with past champion Lydia Ko of New Zealand and Australian Katherine Kirk.More news: During The Pledge, Teacher Has To Be Forced To Leave Boy