The Olympian had been shoulder-to-shoulder with cross country champion Liam Adams for most of the course.
“We kind of worked together into the headwind make sure the boys didn’t catch us and then it was on for the last few [kilometres]," St Lawrence said at the Bondi Beach finish line.
“I tried to drop him down the hill but I forget that he’s probably Australia’s best descender," St Lawrence said.
“[After the final corner] I wasn’t exactly sure how long it was to the finish but I wanted to be in front.”
Pashley, a 29-year-old long-distance runner from Torquay, Victoria took out the women’s honours for the first time, crossing the line at 46.21 minutes.
“I’m stoked,” Pashley said at the finish line. “It’s a really great feeling.”
“I think I went out a bit hard today and it was very painful and every gradual incline was hurting quite a lot,” she said.
“I’ve done this run a few times and I thought it would be an amazing race to win… I can’t believe it.
“I’m looking forward to my friends finishing so we can all celebrate together.”
At just 18 years old, elite wheelchair winner Rizzo was the first competitor across the finish line with a time of 38.5 minutes.
“Heartbreak was definitely a killer,” a puffed but elated Rizzo said.
“[It’s] a great event,” he said.
De Rozario was beaming after her stellar performance, crossing the line at 43.2 minutes.
“It is beautiful … it’s a great race, a tricky course [but] there were so many people out there saying great things so it was really fun,” the 25-year-old said.
Echoing Rizzo, de Rosario dubbed Heartbreak Hill the toughest patch, but the downhill stretch was “pretty nice”, she said.
Just under 80,000 people streaked past the starting line at Hyde Park for the 14 kilometre race to Bondi Beach in the 48th year of what has become the world’s biggest fun run.
Heartbreak Hill’s two-kilometre ascent tested the mettle of even the toughest competitors. Runners hit the incline just when they most need a reprieve for their quads of jelly.
Several race veterans quipped: "Heartbreak Hill is only hard because your heart is broken before you get there".
But the downhill is often where the race is run or lost, veterans say, with many underestimating the energy they need to keep in reserve for the descents.
Conditions were perfect as the undulating crowd were corralled at the Hyde Park starting line. Temperatures hovered around 12 degrees, with a light breeze and more patches of blue skies.
Premier Gladys Berejiklian was high-fiving participants are they set off.
A smattering of rain didn’t dampen the mood as the elite runners were already making their way past Rushcutters Bay.
As throngs of fun-runners still make their way through the course, they are shy of this year’s $5 million fundraising goal, with more than $4.1 million raised for more than 1000 charities.
Many participants were more reveler than competitor, donning vibrant and elaborate outfits that delighted the crowds lining the course, including the Stanley-Jones family, who have worn head-to-toe gorilla suits every year since 1986.
Olympian and long-distance champion Steve Moneghetti still holds the City2Suf record of 40:03 set in 1991.
Susie Power set the women's record time of 45:08 in 2001.
Susie Power has held the women's record time of 45:08 since 2001.