New Zealand's Sophie Pascoe has won her second gold, and third medal, of the Paralympics with a world record time in the S10 100m butterfly.

The 19-year-old, who won gold in the S10 200m individual medley and silver in the S10 50m freestyle, set a new world record of 1:04:43, almost half a second faster than the world record she set in the heats.

She was not challenged in the final, beating out the silver emdal winner Oliwia Jablonska of Poland by four seconds while bronze went to Elodie Lorandi of France who was a further second back.

Pascoe now needs just one more gold medal to equal the three golds and a silver she secured in Beijing four years ago, and has three more events up her sleeve.

If there was such a thing as a blip in a world record and gold medal winning performance it would have been the final touch, where it seemed an age before Pascoe stopped the clock.

"I guess I just didn't time it right and I guess it's those little things, but obviously I got it just in time and got in there," said Pascoe.

"Tonight was about racing the clock, and that's what it is all the time when it comes down to racing, it's about racing the time, you want to go out there and do a PB [personal best] that's the goal, it's not about the gold, it's not about the silver or bronze it's about going out there and doing a PB and if it gets you on that podium, that's what you want."

Pascoe will have two days to freshen up before the back half of her competition, starting with the 100 m backstroke on Tuesday.

This is another strong event for the leg amputee, giving her shoulders a chance to bring home another gold.

"I would like to do a PB in that and see what I can show the crowd, it's all about what we do on the day."

Mary Fisher, a silver medallist in the S11 100m freestyle yesterday, picked up her second medal of the Games, coming third in the S11 50m freestyle.

Fisher set another Oceania record in what was a much closer race, with Cecilia Camellini of Italy winning in a world record time of 30:94s, with silver going to Guizhi Li of China in 31:01s and Fisher finishing in 31:67s.

"We've been working on improving my stroke and times and it's definitely paid off getting a PB and being right up there with world record holders and everyone that's breaking world records," said an elated Fisher.

Tonights other finalist Cameron Leslie also swam a personal best.

Competing in an event he describes as a warm up to his main event, the 150m individual medley where he's the defending champion and world record holder, he went a further two seconds better than his heat this morning finishing the 200m freestyle in 2:54.27.

Fiona Southorn finished seventh in the C5 500m time trial in the velodrome with a personal best.

"I never expected to be in the money but I just really, really wanted to crack that 42 [second mark]."

The 42-year old will become the first Kiwi women to ever ride in the team sprint tomorrow where she will team up with Nathan Smith and Chris Ross.

The yachting team also got their campaign underway, the SKUD 18 pair of Tim Dempsey and Jan Apel securing two 9th placings on day 1 and Paul Francis in the 2.4 boat had a 14th and an 11th placing.

New Zealand now have seven medals in total - two gold, two silver and three bronze.

- © Fairfax NZ News