Tennis Tennis US Open: Muguruza, Sharapova advance Garbine Muguruza and Maria Sharapova were third-round winners, while Venus Williams celebrated becoming an aunty at Flushing Meadows. Sacha Pisani 02 September, 2017 12:04 IST Spanish star Garbine Muguruza stormed into the fourth round with a straight-sets win. - Getty Images Sacha Pisani 02 September, 2017 12:04 IST Grand Slam champions Garbine Muguruza and Maria Sharapova booked their spots in the US Open last 16, while Venus Williams capped a special day for her family.Wimbledon winner and Spanish third seed Muguruza stormed into the next round with a straight-sets win over Magdalena Rybarikova at Flushing Meadows on Friday.Sharapova – a five-time major champion – battled past American teenager Sofia Kenin during the night session in New York.Veteran Venus also progressed to the round of 16 after sister Serena Williams had her first baby.ROUND-UP OF MEN'S SINGLESMUGURUZA STAYS HOTFavourite to win the year's last slam, Muguruza accounted for Rybarikova 6-1 6-1.Muguruza is yet to drop a set at the US Open after easing past the player she beat by the same scoreline in the semifinals of Wimbledon.Her 61-minute victory earned a showdown with two-time Wimbledon champion and 13th seed Petra Kvitova.Kvitova won the battle of the seeds, defeating Caroline Garcia 6-0 6-4.The Czech advanced to the fourth round of a slam for the first time since recovering from a horrific knife attack in December.SHARAPOVA MARCHES ONKenin put up a fight but the experience of former world number one Sharapova paid off in a 7-5 6-2 victory on Arthur Ashe.Playing her first grand slam since the 2016 Australian Open, having tested positive for a banned substance at Melbourne Park last year, Sharapova was challenged but passed the test.Next up for Sharapova is 16th seed Anastasija Sevastova, who beat Donna Vekic 6-2 6-3.VENUS WINS AS SERENA WELCOMES BABYIt was a day to remember for two-time US Open champion Venus and Serena.Venus reached the fourth round with a 6-3 6-4 victory over Maria Sakkari.That was after 23-time Grand Slam champion Serena, 35, gave birth to a baby girl on Friday."Obviously I'm super excited," Venus told ESPN pre-match. "Words can't describe."Carla Suarez Navarro awaits in the last 16, where Sloane Stephens and Julia Goerges will also feature. Read more stories on Tennis. For more updates, follow Sportstar on :