Carpenter saw off challenges from Emmeline Ragot and current World Champion Atherton to claim her first ever World Cup win at the UCI MTB in the women's downhill.
Ragot picked up a puncture during her run which ended her chances of winning and fellow Brit Atherton didn't have the speed to keep up with Carpenter. Though she was said to be battling with an illness all week.
The Welsh mountain biker crashed in the World Championships at the same venue in South Africa last year but came back stronger than ever in this years World Cup and won the series leader's jersey by four seconds.
According to Wales Online, Carpenter said: "I really like this track. I crashed at the World Championships last year which I was gutted about because I thought that I had a chance.
"So I was looking forward to coming back here and it is nice that it is the first race and a nice one to start on so I feel good for the rest of the season."
Carpenter was happy with the result of the race and admits she was nervous before the event.
She said: "I couldn't have asked for a better start to the season because I was really stressed coming into this race so I am just really glad that I managed to pull it off today.
"I was feeling good after practise yesterday and then it got really loose at the top and bits were getting blown out so I was nervous and I had a few moments so I said that I didn't want to do that in my race run but I'm just glad I got a smooth run it."
Carpenter's latest victory can be added to her many other successes over the last few years including winning the Junior British National Mountain Biking Championships, the Junior Mountain Bike and trials World Championships and the Junior Mountain Bike World up all in 2011.
She then added the British National Mountain Biking Championship to her name in 2012.
The 21 year old is set to continue her impressive winning form throughout this season and the rest of her career.
British cycling has dominated in the last two Olympic games, last two Tour de France's and now in the last two mountain bike World Cups.
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