Coan, who won three gold medals at the Rio 2016 Games, won the women's mixed-classification 100m freestyle in 1min 09.11sec, converting to 995 points.

Her closest challenger was 13-time Paralympic champion Jessica Long, also of the US, who scored 990.

Leanne Smith, another home swimmer, claimed the gold medal in the women's 50m breaststroke with a time of 1:03.40 and a total of 855.

Although only good enough for the silver in the women's 100m breaststroke, Colleen Young broke the American women's SB13 record in a time of 1:15.15 for a great total of 1,016 points.

She would take silver behind Australian Commonwealth Games silver medallist Paige Leonhardt who finished in 1:16.22 in the SB14 category for 1,038 points.

Another record was broken in the men's 100m breaststroke when American David Abrahams set a new continental record in the SB13 category with a time of 1:04.07 in the final for a total of 996 points.

Another American, 16-year-old Anastasia Pagonis, broke both the Pan-American record in the women's 100m freestyle S11 as she bids to compete at the Paralympics for the first time later this year, with a time of 1:07.68 .

World champion Lawrence Sapp claimed a home silver medal in his only event of the day, the men's 200m freestyle, in a time of 2:06.73 for 858 points. 

Chile's three-time Parapan American Games champion Alberto Abarza won with 981 points.

Afghanistan-born Mohammad Abbas Karimi continued his quest to represent the first official Paralympic Refugee Team, finishing in a time of 1:41.45 in the men's 100m freestyle.

More than 110 athletes representing 20 nations are competing at the World Para Swimming World Series event this week.