The Russian booked her place in the showpiece courtesy of a 6-4 6-3 victory over Laura Robson’s conqueror Ana Ivanavic, with the reigning French Open champion securing her 500th win on the WTA circuit.
The 26-year-old can take back the world No1 ranking with victory over Williams, but the second seed acknowledged it will be a difficult final as she looks to secure her first win against the American since 2004.
“It’s always tough against her,” Sharapova said.
“I haven’t had a win against her in a long time, but the great thing is that I’m really setting myself up in a position where I can try to change that around.
“I thought I really well against her in Miami for the first set and a half – obviously that’s not enough, but the goal is to keep that level for the whole match this time and open up my chances, take my opportunities.
“It’s been a while since we played on a clay court, too, and every match is different.”
Sharapova is the 36th player to reach 500 career wins with only eight still active – Venus Williams, Serena Williams, Tamarine Tanasugarn, Nadia Petrova, Francesca Schiavone, Jelena Jankovic and Flavia Pennetta.
“That number is pretty significant,” Sharapova added. “I’m pretty proud of that.”