2016 Olympic Trials
Sullivan finished 12th in the 800 freestyle at the 2016 Olympic Trials as a 16 year old.
2017 Winter Nationals
Sullivan finished second in the 1650y free and third in the 500y free at Winter Nationals.
2018 U.S. Open Water Championships
The 2017 Junior National Champion in the 5K won the U.S. Open Water National women’s 5K title in 58:18.168 and finished third in the 10K.
2018 U.S. National Championships
Sullivan earned the bronze in the 1500 freestyle (16:02.88), getting her a spot on the 2018 Pan Pac team, her first ever USA “A” team. She also fifth in the 800 freestyle (8:26.98), 37th in the 200 backstroke (2:14.45), and 39th in the 400 IM (4:53.60) at the Phillips 66 National Championships.
2018 Age Group Swimmer of the Year – 17-18
From the pool to open water, Erica Sullivan had a stellar season in the 17-18 age group. Sullivan finished as the top-ranked junior in the 800 and 1500 frees in long course and the 1000 and 1650 in short course. In fact, she was 5th among American swimmers of any age in the 1500 (16:02.88) and 800 (8:26.27) in long course. In short course, she had the 2nd-best 1000 free (9:17.32) in the nation behind only the great Katie Ledecky, and had the third-ranked 1650 free (15:36.52).
On June 22, 2017, Sullivan announced her verbal commitment to swim for the University of Southern California. At the time, she was ranked as the #8 recruit in the class of 2018. In September of 2018, it was announced that Sullivan would sit out a semester, which later turned into deferring her enrollment until after the 2020 Tokyo Olympics. After Dave Salo retired following the 2020 season, Sullivan ultimately wound up decommiting to USC and later committed to Texas.