Wimbledon champion Muguruza was equally happy to get her title bid off to a winning start with victory over French Open victor Ostapenko, the youngest player in the eight-woman field.
Venus is also the only former WTA Finals victor playing in Singapore but she will need to come through five tough matches against top-eight opponents in a week if she is to add to her 2008 success with what would be a first title of the season.
Pliskova served five aces as she dominated with her first serve, as the world number eight struggled for rhythm on a slow court. I think it was very tough - from the baseline we were both playing pretty fast and pretty good shots so it was an unbelievable match I think. Serving to stay in the encounter, the American showed some fight as she saved three consecutive match points, though could not save a fifth as Pliskova broke once again to seal a strong win.
While it was clear that Williams was the one whom the audience was more excited to watch, it was her opponent Karolina Pliskova who had more to cheer about at the end of their 73-minute encounter. I knew going into the match that she could play unbelievable, so I kind of went in prepared.' 'Here it's important to start with a win and every game counts', Muguruza added.
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Sanders said Friday that if the "spirit" in which Trump's comments "were intended were misunderstood, that's very unfortunate". Wilson, who is black, fired back Friday when she told The New York Times "The White House itself is full white supremacists".
"There are no easy matches here in Singapore so you have to be ready from the first point - that's what I was trying to do today and it worked".
Halep said the result was that every match would be "like a final" in Singapore, where action gets underway at the Indoor Stadium on Sunday.
"I know there are so many girls, players, that have the chance. (But) I'm going to fight for that".
"Well, the day that I won the match against Ostapenko, that was the best day, by far, best feeling". Billie Jean King was 39 in 1983 and Martina Navratilova was 38 in 1994.
Now is a good time to actually see the planet Uranus
For perspective, NASA says, if Earth was the size of a nickel, Uranus would be about as big as a softball. It's a very good time to look at the sky, thanks to a new moon tonight that's keeping the sky dark.
Williams said she was confident of rebounding from the defeat.
Williams, resurgent after her battle with Sjogren syndrome, an autoimmune disorder, has had a remarkable year, reaching two Grand Slam finals and qualifying for the WTA Finals for the first time since 2009.
"I don't know how she felt but I think I was trying to take that advantage that I was here a year ago".
The Red Group gets under way on Monday, with seven of the eight finalists able to finish the year as world number one.
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Tyler Tenbrink , 28, reportedly came out of the vehicle brandishing a gun after one of the protesters hit the Jeep with a baton. Tenbrink is a convicted felon, police noted, and could face an additional charge of being a felon in possession of a firearm.