Native to Nashville, Tennessee, Alex Walsh has been a force in the water since she began swimming competitively at age seven. Growing up in a family that valued athleticism and perseverance, Alex found her passion for swimming early on. Alongside her sister Gretchen, Alex's natural talent and relentless dedication quickly became apparent. By the time she was 12, Alex was already smashing records in her age group across all strokes, showcasing her versatility and strength in the pool. She still holds the national records for the 100 breast and 200 breast in the 15-16 age group, a testament to her exceptional abilities and hard work.

Alex's early swimming years were marked by the support and camaraderie of her sister Gretchen, who shared her passion for the sport. The Walsh sisters pushed each other to new heights, both in training and in competition. Their friendly rivalry and mutual encouragement helped shape Alex into the elite athlete she is today. Growing up in Nashville, a city not traditionally known for swimming, the sisters' achievements drew attention and admiration from the local community. Alex's early success laid the foundation for her illustrious career, setting the stage for her future accomplishments on national and international stages.

As a prominent member of the Harpeth Hall swimming program, Alex contributed to one state title (2017) and two Swimming World National Championship titles (2018, 2019). Individually, Alex is a two-time state champion and was crowned Tennessee High School Female MVP all four years. In her senior season, Alex set the National High School record in the 100 back, clocking in at 51.35.

Alex joined the Nashville Aquatics Club in 2014, competing for the club until 2019. Her impact on the team is highlighted by the club records she set in the 50 back, 200 back, and 200 IM in 2019, as well as her MVP award in 2016. As Alex prepared for her college career, she was deemed as a top five recruit for the Class of 2020.

During her time at the University of Virginia, Alex Walsh established herself as a formidable force in collegiate swimming. She played a pivotal role in the team's success, helping the Cavaliers secure back-to-back NCAA championships in 2021 and 2022. Alex earned All-American honors in multiple events, including the 200-yard individual medley, 200-yard freestyle, and 100-yard backstroke. She set school records in these events, with times of 1:52.38 in the 200-yard IM, 1:42.28 in the 200-yard freestyle, and 50.56 in the 100-yard backstroke. Her dedication and hard work earned her numerous accolades, including being named ACC Swimmer of the Year in 2022, making her one of the standout athletes in the program's history.

On the international stage, Alex Walsh has represented the United States twice in the Olympics. She recently competed in the women’s 200-meter individual medley at the Paris 2024 Olympics. Her most distinguished achievement came at the Tokyo 2020 Olympics, where she earned a silver medal in the 200-meter individual medley with a time of 2:08.65, showcasing her talent to a global audience. She also competed in the World Championships, securing a bronze medal in the 200-meter IM with a time of 2:09.21. At the Pan Pacific Championships, Alex added to her medal tally with a gold in the 200-meter freestyle with a time of 1:56.18 and a silver in the 200-meter individual medley at 2:09.60. Her success in these international competitions highlights her ability to compete against the best in the world and underscores her status as a rising star in the sport.

On the international stage, Alex Walsh has represented the United States with distinction. Her most notable achievement came at the Tokyo 2020 Olympics, where she earned a silver medal in the 200-meter individual medley with a time of 2:08.65, showcasing her talent to a global audience. She also competed in the World Championships, securing a bronze medal in the 200-meter IM with a time of 2:09.21. At the Pan Pacific Championships, Alex added to her medal tally with a gold in the 200-meter freestyle with a time of 1:56.18 and a silver in the 200-meter individual medley at 2:09.60. Her success in these international competitions highlights her ability to compete against the best in the world and underscores her status as a rising star in the sport.