Serena Williams conceded she had been rusty on her return to professional tennis after more than a year away from the game but still did enough to secure a 7-5 6-3 win over Zarina Diyas in the first round of the BNP Paribas Open on Thursday.
Former world number five Bouchard was outclassed by 100th-ranked Vickery in her first match since reaching a settlement with the US Tennis Association (USTA) over a locker room fall during the 2015 US Open.Her weak second serve was particularly costly as Vickery pounced time and again in front of a sparse late-afternoon crowd on centre court.
Sharapova's world ranking of No.41 forced her to play a first-round match in the tournament she has won twice. But Osaka held to go up 5-4 and broke Sharapova on a double fault to close out the set.
She trailed 4-1 in the first set before holding serve at 4-all. This was Sharapova's first opening-round loss in Indian Wells and the first time since 2003 when Sharapova had a three-match losing streak.
The 36-year-old gave birth to daughter Alexis Olympia on September 1, but says post-childbirth health complications that included blood clots in her lungs were nearly fatal.
In earlier action, American teenager Amanda Anisimova recorded her first top-level victory with a 6-2 6-2 thrashing of Pauline Parmentier. The 16-year-old Anisimova, who earned a wild card into the main draw, is the U.S. Open junior champion.
Caroline Dolehide, a 19-year-old wildcard, fired 11 aces to outlast 78th-ranked Shelby Rogers 3-6 7-6 (8-6) 6-3.
On a cool night in Indian Wells, the 20-year-old Osaka put on a powerful hitting display to wrap up the hard-fought first meeting between the pair in 1 hour, 37 minutes.