The key blow was struck in the seventh end when Martin , the reigning Olympic champion , stole a point for a 4 - 3 lead .
In earlier quarterfinal action , Martin outlasted rival Stoughton by a 5 - 3 score .
The key blow was struck in the seventh end when Martin , the reigning Olympic Martin , stole a point for a 4 - 3 lead .
In earlier quarterfinal action , Martin outlasted rival Stoughton by a 5 - 3 score .