The 27-year-old SB4 competitor, who won two gold medals at last year's Paralympic Games in Rio de Janeiro, topped the podium in the women’s 50 metres breaststroke mixed classification event with a total of 965 points.

Sweden’s Maja Reichard, who competes in SB11, was second, while Germany’s SB5 swimmer Verena Schott did enough for third.

Rung then picked up her second win of the day, and third of the meet, as she reigned supreme in the women's 200m individual medley, which was another mixed classification race.

The Norwegian claimed 994 points to beat American star Jessica Long, a multiple Paralympic champion in the SM8 class, with Hungary’s SM10 competitor Bianka Pap rounding off the podium.

"I feel great, it’s good to back in the pool and compete again," Rung said. 

"It’s not my best races but I’m happy with my times. 

"Now I can use these times and these races to evaluate where I stand and continue working from there."

Triple Paralympic champion Rebecca Meyers of the United States won the women’s 200m individual medley with a score of 1001 points as the S13 swimmer finished in front of Germany’s Naomi Maike Schnittger, who competes at S12, and S14 racer Pernilla Lindberg of Sweden.

Meyers earned another podium in the women’s 100m butterfly as she was third behind silver medallist Ellen Keane of Ireland and winner Zsofia Konkoly of Hungary, who ended with 883 points.

The Irish swimmer, who takes part in the S9 class, went on to clinch victory in the single class women's 200m individual medley as she touched the wall in 2min 42.97sec, in front of Denmark's Laura Martens Christensen and Emma Danielsson of Sweden.

S10 athlete Lasse Winther Andersen delivered gold for the host nation as he emerged triumphant in the men's 100m butterfly mixed classification with 799 points.

Ireland’s S9 swimmer Barry McClements was second, while European bronze medallist Niels Mortensen added to the Danish haul with bronze.

Mortensen, who competes in the S8 class, was able to get his hands on his second gold of the historic meeting in the Danish capital as he won the men’s 200m individual medley with 840 points.

Norway’s SM14 athlete Adam Ismael Wenham and Belgian rival Aymeric Parmentier, also classified as SM14 were second and third respectively.

The next Para Swimming World Series event is scheduled to take place in São Paulo in Brazil from April 21 to 23.