Maggie MacNeil, the reigning World Champion in the 100-meter butterfly, threw down a 49.57 100-yard butterfly on Friday at Canham Natatorium in Ann Arbor. Originally scheduled as a tri-meet against Tennessee and Virginia, the meet was reconfigured as an intrasquad competition after Tennessee and Virginia withdrew for safety concerns. MacNeil’s swim, a stunning performance so early in the season, is the fourth-fastest performance in NCAA history. The Michigan sophomore lowered her personal best of 49.59, which had previous been the fourth performance, by .02.
| Rank | Time | Athlete | Nationality | Meet | Date | Location |
| 1 | 49.26 | Louise Hansson | SWE | 2019 NCAA DI Women’s Swimming | 3/21/2019 | Austin |
| 2 | 49.34 | Louise Hansson | SWE | 2019 PAC-12 Women’s Champs | 2/28/2019 | Federal Way |
| 3 | 49.43 | Kelsi Dahlia | USA | 2016 NCAA DI Womens | 3/17/2016 | Atlanta |
| 4 | 49.57 | Maggie MacNeil | CAN | 2019 Michigan Intrasquad | 10/18/2019 | Ann Arbor |
| 5 | 49.59 | Maggie MacNeil | CAN | 2019 Women’s B1G Ten Champs | 2/21/2019 | Bloomington |
| 6 | 49.66 | Maggie MacNeil | CAN | 2019 NCAA DI Women’s Swimming | 3/21/2019 | Austin |
| 7 | 49.80 | Louise Hansson | SWE | 2018 NCAA DI Womens Swim | 3/15/2018 | Columbus |
| 7 | 49.80 | Louise Hansson | SWE | Texas Hall of Fame Swimming In | 11/29/2018 | Austin |
| 9 | 49.81 | Kelsi Dahlia | USA | 2015 NCAA D1 Womens | 3/19/2015 | Greensboro |
| 10 | 49.85 | Erika Brown | USA | 2018 SEC Swimming & Diving Cha | 2/15/2018 | College Station |
| 10 | 49.85 | Erika Brown | USA | 2019 SEC Champs | 2/20/2019 | Athens |
Last October 19, MacNeil went a personal-best 51.49 in the 100 fly while competing in the Michigan vs Northwestern dual meet. A month later at the B1G-ACC Challenge she improved her PB to 50.09. She swam her best time of the season, 49.59, at B1G Championships breaking Big Ten, meet, IU pool, and Michigan team records. Her new time of 49.57 lowers her Big Ten, U-M pool, and Michigan program records.
MacNeil, a sophomore from London, Ontario in Canada, won the 100-meter butterfly title at 2019 FINA World Championships, beating defending Olympic champion Sarah Sjostrom. Her 55.83 set new Commonwealth, Americas and Canadian records.
SwimSwam will cover the full meet at its conclusion.
Watch out Sjostrom 👀👀👀
Wow. What a swim. Maybe sub-49 at NCAA’s?
Kinda thought her Worlds won was a fluke, but now I think Sjostrom’s in for a fight in Tokyo.
Yeah and I hope Sjostrom will be back in her greatest form.
Wow Maggie is swimming great. Congratulations to all MICH swimmers, divers, coaches and alumni.
She will win gold at the olympics next year!
Dialed in.
Casual.
Well, my friends in the NCAA, purchase your best glue. Maggie McNeil coming for every wig in sight!
What a quaint analogy! But yeah, she is throwing down