Siobhan Haughey won her fourth gold medal of the Mare Nostrum Swim Tour on Wednesday, this one coming in the 100m freestyle event on Day 1 in Barcelona.

Competing in her only discipline on the opening day, a time of 55.45 seconds was enough to easily see the 26-year-old through the preliminary heats.

The Hong Kong swimmer then improved her time to 52.76 in the final, touching the wall 1.11 seconds ahead of Swedish swimmer Michelle Coleman.

Haughey took gold in the 100m breaststroke, 200m freestyle and 100m freestyle at the Tour's opening leg in the French town of Canet-en-Roussillon.