Looking to build on her historic sophomore season, De Rooi didn’t disappoint as she remained a staple atop the NAIA swimming rankings during the 2019-20 season. After UC started the year 4-0 in dual meets, the Patriots went to the Magnus Cup where De Rooi re-wrote the record book. She brooking the school record in the prelims of the 100 fly with a time of 54.56, before becoming the first Patriot to win an event at the NCAA D1 meet, touching the wall in 54.69 in the finals. The junior followed that up by leading off the 800 free relay with a 1:52.51 split, which was over a second faster than the previous school record. De Rooi’s strong season continued at the MSC Championship, where she was a seven-time all-conference selection, six-time conference champion, and set four MSC meet records. De Rooi won the 500 free (5:04.36), 100 fly (54.51), and 100 free (51.43) for her seventh individual conference title, which ranks third in conference history. De Rooi also became the second swimmer in MSC history to win multiple Athlete of the Year honors. The Lelystad, Netherlands native continued her dominance at the NAIA National Championships, where she recorded three individual national titles, posted eight All-American performances, and was the named the NAIA Swimmer of the Year and earned the NAIA Swim of the Meet. The junior won opened the meet winning the 500 free (4:58.51) to become the first Patriot since Christen Heideman in 2003 & 2004 to successfully defend a national title. De Rooi won both the 100 fly and 100 free to notch her seventh national title, while her 100 fly time of 53.99 was named NAIA Swim of the Meet.