Marlene DeBoer, a Dutch professional triathlete, has made significant strides in her athletic career. She marked her transition from Age Group races, where she claimed numerous victories, to the professional field with a memorable win at the Ironman 70.3 Cork in Ireland. This victory in 2023 was her first as a professional athlete, highlighting a pivotal moment in her career. Additionally, De Boer secured a notable second-place finish at the 2023 Europe Triathlon Challenge Long Distance Championships in Almere, showcasing her prowess in long-distance triathlon. She finishes 3rd at Ironman Cozumel to finish her 2023 season.