In women's singles, top seed Pliskova of the Czech Republic was upset by France's Caroline Garcia in the second round.
"Our original partnership was mainly focused on the World Cup in China. We are thrilled that this has now expanded to be a more all-encompassing partnership across all FIBA competitions."
Duplantis tried to challenge Sergei Bubka's 26-year-old outdoor record of 6.14 meters, but failed to continue after one unsuccessful attempt at 6.15 meters as darkness set in.
Asked whether he would be willing to return to England in the future, Bale replied, "If those options arise, it is something I'd look at for sure."
Members of the US women's team filed a lawsuit against their federation in March because of alleged discrimination over wages. A federal judge ruled against the players, who have since lodged an appeal.
"It was anybody's game really for a set and a half. I made some breaks and then obviously after winning the second set I felt more comfortable. I was returning better, I started to read his serve better, and I was pleased with my serve. Overall, it was a very good test, and I am happy to get through," said Djokovic, who is bidding to capture his fourth US Open trophy and 18th Grand Slam title.
American rider Quinn Simmons took silver and bronze went to Damien Howson from Australia. Enditem
Bale added that despite apparently not being in Zidane's plans, Madrid had stopped him moving last season.
Fourth seed Naomi Osaka of Japan booked her place in the third round with a comfortable 6-1, 6-2 win over Italy's Camila Giorgi.
Duan Liuyu sent a long-distance shot off the cross-bar in the 45th minute, while Marouane Fellaini saw his header hit the post in frustration in the 61st minute. Enditem
The 23-year-old Dutchman has signed a five-year contract at Old Trafford, with an option to extend by a further year. The transfer fee is 39 million euros (46 million U.S. dollars), which may increase to 44 million euros if certain clauses are met.