Sharapova's ranking of No. 41 in the world forced her to play a first-round match in the tournament she has won twice. A failed doping test led to a 15-month ban for the five-time major winner.
Yuki, seeded ninth, edged past America's Dennis Novikov 7-5, 7-5 while Ramkumar defeated Michael Mmoh 6-3, 7-5 in his first-round match in the qualifiers on Wednesday.
Serena, a winner of 23 Grand Slam titles, is in the same quarter of the draw as older sister Venus, the siblings could potentially face each other in the third round of the tournament.
Federer emerged from the tunnel of smoke and walked onto the court greeted by roars and thousands of camera phones held high for the first Bay Area appearance of his career.
The Williams sisters were the headliners Monday night in the Tie Break Tens tournament in Madison Square Garden, an eight-woman event in which all matches were 10-point tiebreakers, instead of the usual games and sets.
Paes, who reached the final in Dubai with Jamie Cerretani last week, jumped to 46, two places behind Divij Sharan (44), who gained one place, while, Rohan Bopanna remains unchanged at number 20.
The 29-year-old Argentine star beat three straight players ranked ahead of him in the hard-court event, topping No. 6 Dominic Thiem in the quarterfinals, No. 5 Alexander Zverev in the semifinals and eighth-ranked Anderson in finals.
Seeded seventh in the hard-court event, she was three points from losing the match in the second set in the match that took 2 hours, 45 minutes.
The third-seeded Bautista Agut denied the second-seeded Pouille his own second title this year and a chance to break into the top-10 rankings for the first time.
Paes, playing his 97th ATP World Tour event, and America's Cerretani lost the final 2-6 6-7(2) in one hour and 27 minutes.
Federer has not played in the French Open for the last two years in order to give rest to his body and focus on other events where he has greater chances of winning.
The second-ranked Spanish star hasn't played since retiring in the quarterfinals of the Australian Open in late January.
The sixteen-time grand slam champion was slated to face fellow Spaniard Feliciano Lopez in the opening round of the tournament on Wednesday.
In the Sportsman of the Year category, Federer waved off tough competition from the likes of Rafael Nadal and Cristiano Ronaldo to bag the honours.
The Swiss star first became world number one in February 2004 and had not topped the rankings since October 2012 before reclaiming it again in Rotterdam.
Schwartzman, seeded sixth in the clay-court event at Jockey Club Brasileiro, will enter the Top 20 in the world for the first time Monday. He also won an outdoor clay event in Istanbul in 2016.
It should be noted that Federer has won the tournament seven times, which accounts for the most number of Dubai Championships title lifted by any player.
Verdasco will play fifth-seeded Fabio Fognini of Italy, a 6-7 (3), 6-3, 6-1 winner over Alijaz Bedene of Slovenia in the late match.
Cilic won only one match on the clay in Rio in his first tournament since he reached the Australian Open final in January.
Monfils finished Cilic off in 5 minutes after their match was interrupted by heavy rain on Wednesday night.
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