The 165-yard 16th hole proved the difference as Zhang three-putted on the way to a bogey four. Yin answered with a birdie two for a two-shot swing and a one stroke lead she would never relinquish in her bogey-free round.
The World Cups will feature 20 female and 20 male athletes, including the world champion, qualified players from all completed continental events (Africa, Europe and Pan America), players selected by world ranking from the other continents (Asia and Oceania), and others according to the provisional World Cup playing system. A maximum of two players per association are allowed for each World Cup event.
"I played pretty aggressively from the first ball, and that's pretty necessary against her because she's a great player who can hit a lot of great angles," Mertens said. "I tried to step into the court, and thankfully my first serve was working, so that was a big advantage."
Barcelona insisted that he had to pay his 700-million-euro release clause.
"I thank all of you, those of you who are Roma fans and those that aren't, for the support, I will be back soon!" Enditem
On paper, the Real Madrid squad doesn't look much stronger ahead of the new campaign than it did at the end of the last one, and any major arrivals appear unlikely. However, the summer chaos at FC Barcelona and the fact that Atletico Madrid haven't made any signings either implies that merely by standing still, Real could open up a gap.
Joining them on the list are Japanese Harimoto Tomokazu and Niwa Koki, and Timo Boll from Germany.
BWF said the Badminton Association of Thailand cited special circumstances related to COVID-19 in addition to injuries to key players in making the decision.
Reigning champion Barty said there were two reasons for her decision to skip the clay-court tournament, which is scheduled to take place in Paris from September 27 to October 11.
Ruichang defeated Hunan Hualai 4-1 to continue sitting second, leaving their opponents in third place.
Yates was dropped on the final climb of the 153km from Pau to Laruns, which was the second day that the race took place in the Pyrenees.