Roland Garros favorites hitting their peak form at the right time

Rafael Nadal and Serena Williams fired warning shots to their French Open rivals with comprehensive victories over Roger Federer and Victoria Azarenka respectively in Rome on Sunday.

Nadal has produced some blistering tennis since returning from a seven-month injury absence and his seventh victory in nine years on the red clay of Rome left his Swiss rival in no doubt as to the Spaniard's prospects of lifting an eighth French Open title.