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Greco proved she was the woman to beat in the C1-3 3000m individual pursuit after shaving more than seven seconds off her world record time in qualifying.
'HEARTBREAKING': Shock moment at Paralympics opening ceremony
She then went one better in the final against China’s Xiaomei Wang.
Greco shaved more than two seconds off her time after she posted 3:50.815 to win the gold medal.
The gold medalist spoke to Channel 7 after the race and fought back tears in beautiful scenes.
'Sorry, I'm just so happy," Greco said as she wiped away tears.
"I can't believe we did it. It was a good race, I still can't believe it."
"Yeah, I thank the team, my coach, the support is just amazing.
"My family and friends, I wouldn't be here without them."
Fans went wild over the world record and the first gold for Australia at the Paralympics in Tokyo.
Australia claim two gold in cycling
Not long after Australia claimed its second gold medal of the Paralympics when Emily Petricola lapped American rival Shawn Morelli to take out the C4 3000m pursuit.
The Australian made a shaky start against Morelli and looked in trouble when she was .951 of a second down after the first lap.
But the 41-year-old from Queensland, who was diagnosed with multiple sclerosis 14 years ago, then dominated their ride-off and caught Morelli well inside the last kilometre.
Petricola also broke her own world record when she qualified fastest in 3:38.061.
Lemon trailled early against Keely and could not pull back the deficit, losing by more than a second.
All three Australians are making their Paralympic debuts while Greco and Petricola came into the Games as defending world champions in their individual pursuit categories.
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