Jensen and Castello have now made it to two semi-finals in three tournaments, making it there in Abu Dhabi as well.
The Spaniards defeated their fellow countrywomen Josemaria and Sanchez 6-3 7-6, putting Josemaria and Sanchez's status as number ones in great peril.
Nine-seed Jensen and Castello will face Aranza Osoro and Lucia Sainz on Saturday for a place in the final, with neither player ever making it to that stage. Should Jensen qualify on Saturday, she would become the youngest woman to ever reach a final at 17 years and seven months old.
Watch the match highlights below!
