A number of games are down for decision.
Japan's Naomi Osaka has won her first Grand Slam match since pulling out of the French Open.
She defeated Czech player Marie Bouzkova 6-4, 6-1 in the first round of the US Open in New York.
Later on today, top seed Ashleigh Barty will meet Vera Zvonareva.
Andy Murray has been knocked out of the men's singles.
He went down in five sets to Stefanos Tsitsipas having been 2 sets to 1 ahead.
World number one Novak Djokovic is to take on Holger Rune later today.
Two Injuries And Possible Suspensions For Ireland Ahead Of Saturday's Game With Japan
Lunchtime Sports Update
FloMAX Liffey Celtics Secure First Win In Domino's Women's Super League
Monday Morning Sports Update
Sunday Mornings Sports Update
Grangenolvin And Sallins Victories In The Leinster Club Championship Yesterday
Friday Evening Golf Update
Former Dublin Player Jason Sherlock Joins Roscommon Management Team
