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The 26-year-old is in third place after the opening day of the event and has stunned some more seasoned campaigners with a strong performance across all three events.
Greene, who burst on to the crossfit scene last year when she beat about 80,000 competitors around the world to win the 2016 Crossfit Games Open, exhibited tremendous stamina to win the amanda.45 event.
She placed fourth in the run-swim-run challenge and 11th in cyclocross to be in third place in the overall standings.
Greene, who lives in Abu Dhabi and is representing the Africa region, will resume competing at 6am today (NZ time). Some of the events coming up may suit the bigger competitors, but the 163cm power-packed New Zealander has certainly impressed with a haul of 242 points.
Australian Tia-Clair Toomey and England’s Samantha Briggs lead the standings with 262 points each. Briggs has not finished outside the top five in any of the three events, while the 23-year-old Toomey has had a first and a second placing and was eighth in the cyclocross.
Greene’s mother, Anita Greene, is in Wisconsin and watched her daughter compete.
"We are just so incredibly proud of her," Anita said.
"It has gone beyond her dreams.
"The next few days may not go her way or they may go her way. But whatever happens, today has been a pretty amazing day."
Greene, who is competing at the Crossfit Games as an individual for the first time, got her start in the sport when her mother brought her a crossfit voucher for Christmas while she was still living in Dunedin.