Naomi Osaka, who is currently ranked No. 1 in the world, is concerned about her chances of making another deep run in New York.
In the Barty-Sharapova tie, the Australian fired 18 winners, breaking Sharapova four times as the Russian made 31 unforced errors in her 6-4, 6-1 defeat.
Serena Williams registered a straight-set victory over Naomi Osaka to storm into the semifinals of the Rogers Cup.
Previous year's champion Naomi Osaka, as well as World No.1 Ashleigh Barty will compete at US Open 2019.
Osaka, who was ranked No. 1 in the world until last week, lost to Yulia Putinseva 7-6 (4), 6-2 on Monday in the first round at Wimbledon.
Williams was outplayed in the third round of the French Open by 20-year-old American Sofia Kenin, who used clean, deep groundstrokes to put together the 6-2, 7-5 upset Saturday.
The No. 1-ranked Osaka couldn't muster a comeback after falling way behind yet again at the French Open, losing 6-4, 6-2 in the third round to No. 42 Katerina Siniakova of the Czech Republic.
Novak Djokovic beat Switzerland's Henri Laaksonen in straight sets to set up a third-round clash against Salvatore Caruso.
Five times just two points from defeat in a swirling wind, Osaka held it together enough to overcome all of those miscues and stretch her winning streak at majors to 15 matches by beating Schmiedlova.
Federer reported a right leg injury ahead of his match against Stefanos Tsitsipas, while Osaka said her right hand was injured before she was to play Kiki Bertens.
Federer saved all seven break points he faced to beat Joao Sousa 6-4, 6-3, then was to play Borna Coric for a spot in the quarterfinals.
Osaka easily won the first set before Vekic looked to have seized control of the match by winning the second and building up a 5-1 lead in the third.
Novak Djokovic lost 6-4, 6-4 to Philipp Kohlschreiber in the third-round while Naomi Osaka lost to Belinda Bencic 6-3, 6-1 in the fourth round.
The move comes two and a half weeks after Osaka surprisingly split from coach Sascha Bajin, who previously worked with Serena Williams.
The two-time major champion had trouble with her serve and was beaten 6-3, 6-3 by 67th-ranked Kristina Mladenovic at the Dubai Championships.
The two-time Grand Slam champion admitted that the upcoming tournaments, including Dubai Championship, are important for her.
Osaka's second consecutive major title, following her success at the U.S. Open last year, helped her rise three spots.
Novak Djokovic, a 31-year-old already ranked No. 1, now has won the past three men's Grand Slam titles.
The victory allows the 21-year-old Osaka to become the first tennis player from Japan to reach No. 1 in the rankings.
Petra Kvitova defeated Danielle Collins 7-6 (2), 6-0 while Naomi Osaka downed Karolina Pliskova 6-2, 4-6, 6-4 in the semi-finals to set up a summit clash against each other.
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