It was the Russian's first competitive match since she withdrew from the St Petersburg Open in January.
Maria Sharapova's hopes of a second successive WTA Tour title ended when she was shocked by fellow Russian Elena Dementieva in the Los Angeles Open semi-finals.
Maria Sharapova saved a match point to beat Li Na 4-6, 6-4, 7-6 (7/5) in the Italian Open final on Sunday after a two-hour rain break effectively turned the match into a tiebreak shootout.
The Russian will meet Patty Schnyder, who beat number four Elena Dementieva, in the semi-finals of the Acura Classic.
Former world number one Maria Sharapova won her second Pan Pacific Open title after Jelena Jankovic retired with a wrist injury in Saturday's final. It was Sharapova's first title since shoulder surgery last October and the 20th of her career. Her last tournament win came at Amelia Island in April 2008.
Poland's Agnieszka Radwanska used her wits to defeat world number two Maria Sharapova 7-5, 6-4 to win the Sony Ericsson Open final on Saturday and once again deny the Russian.
Former world number one Maria Sharapova battled back from a torrid start against French teenager Caroline Garcia to book her place in the French Open third round with a 3-6, 6-4, 6-0 victory on Thursday.
Maria Sharapova advanced to the Sony Ericsson Open final by beating Caroline Wozniacki 4-6, 6-2, 6-4 on Thursday in a two and a half hour battle.
Former Wimbledon champion Maria Sharapova started her grasscourt season in convincing fashion with a 6-4, 6-2 first-round win over Canada's Stephanie Dubois in the Edgbaston Classic in Birmingham on Monday.
A summary of sports events and sports persons, who made news on Friday.
Russian fourth seed Elena Dementieva picked up her third title of the year and denied compatriot Maria Sharapova a comeback win with a 6-4, 6-3 victory in the final of the Toronto Cup Sunday.
Russian tennis ace Maria Sharapova was reportedly tormented on Saturday with the inaugural International Premier Tennis League tournament's shot-clock, saying that she feels like pressing the snooze all the time.
Italy's Flavia Pennetta stunned former world number one Maria Sharapova 6-2 4-6 6-3 in the semi-finals of the LA Championships on Saturday.
Tennis great John McEnroe finds it hard to believe that Maria Sharapova was unaware she was taking a banned drug that led to her suspension, the seven-time Grand Slam champion said on Saturday.
Olympic bronze medallist Saina Nehwal is placed fourth in the list headed by American tennis legend Serena Williams followed by Maria Sharapova and elder sister Venus.
More than 1,800 Thais and foreign tourists are confirmed to have died and the death toll is expected to climb.
'Sharapova has been a US resident since early in her career, which does bring in a question of how or why she is using a drug that is not licensed there'
Defending champion Li Na was shown the door while Maria Sharapova remained on course for a maiden title after the fourth round of the French Open on Monday.
Newly crowned French Open champion Maria Sharapova took her Coupe Suzanne-Lenglen trophy to the Eiffel Tower on Sunday.
Maria Sharapova continued her build-up for Wimbledon by winning back-to-back matches to reach the quarter-finals of the Edgbaston Classic on Thursday.
Wimbledon champion Maria Sharapova has recovered from the illness that forced her to pull out of the Paris Open.
Multiple grand slam champion Maria Sharapova withdrew from the Brisbane International on Tuesday after suffering an arm injury in practise less than two weeks before the Australian Open.
The Wimbledon champion crushed China's Li Na 6-0, 6-2 to become the fifth Russian woman to reach the fourth round.
Tennis was the last thing on former champion Maria Sharapova's mind just five days before Wimbledon as she posed in the window of a luxury department store on Wednesday.
The Wimbledon champion beat Kristina Brandi of Puerto Rico 6-1, 6-4 at the $1.3 million Montreal Cup.
The world No. 1 scraped into the Kremlin Cup quarter-finals when Anna-Lena Groenefeld retired with an ankle injury leading the second-round match 6-1, 4-2.
Former world number one Maria Sharapova is once again trying to hit the fur off tennis balls but admits she may no longer be feared.
Sharapova would stop playing for Russia in the Fed Cup if the 17-year-old Wimbledon champion was invited to join the team next year.
One of Maria Sharapova's biggest sponsors, Nike Inc., said it was suspending ties while the case is being investigated.
A summary of the first day's play at the US Open.
Wimbledon champion Maria Sharapova eased past Luxembourg's Anne Kremer 6-0 6-2 to reach the final.
Ana Ivanovic recovered from an awful start to beat Kaia Kanepi at the Brisbane International on Thursday and remain on track for a glamour meeting with Maria Sharapova.
The blonde Sharapova -- billed the new Anna Kournikova -- was one of eight women given berths in the main draw of the grasscourt Grand Slam.
Maria Sharapova recovered from a woeful start to overwhelm rising talent Simona Halep 1-6, 6-2, 6-3 in the final of the Madrid Open and claim her 31st career title on Sunday.
Maria Sharapova marched into the semi-finals of the Cincinnati Open after crushing Australian Samantha Stosur 6-3, 6-2 on Friday to set up a last four meeting with fellow-Russian Vera Zvonareva.