The second seed whose victory over Petra Kvitova in the semi final catapulted her to the top of the WTA rankings is the 10th woman in history to win all the four majors.
Sharapova broke into the limelight by winning at Wimbledon in 2004. At that time, her age was just 17. Two years later, the Russian triumphed at the US Open. In 2008, she picked up the Australian Open title.
On Saturday, Sharapova raced to a 4-0 lead in the first set before two double faults cost her the 5th game. Both players subsequently held their serve. Though Errani was 15-40 down in the 8th game, Sharapova could not take advantage.
That did not matter as the latter served out for the set and also broke Errani in the 1st game of the second set to seize the initiative.
When Sharapova was leading 2-0, the crowd on the Centre Court at Roland Garros tried to boost her Italian opponent. Buoyed by their support, the 21st seed won the 3rd game but Sharapova crucially denied her a break in the 4th.
The duo then traded breaks to make the score 4-2. Sharapova who will take over as the world No 1 on Monday pulled ahead in the next two games to seal a famous win.