What could Rafael Nadal do to improve his clay-court game?

The Majorcan has reached the quarter-finals of the French Open by dropping just 19 games – he conceded just a couple in his fourth-round match with his friend Juan Monaco – and so is now just three matches away from winning a record seventh title at Roland Garros. He is widely regarded as the greatest clay-court player of all time, pushing Bjorn Borg into second place. But what could he do to improve? Perhaps you have spotted the tiniest of weaknesses, something for Nadal and his uncle Toni to work on before Wednesday’s match with Nicolas Almagro? Please send your suggestions to mark@thetennisspace.com