Elsewhere, fifth seed Alexander Zverev of Germany beat Frenchman Adrian Mannarino 6-7 (4), 6-4, 6-2, 6-2 to advance, while fourth seed Stefanos Tsitsipas of Greece was upset by Croatia's Borna Coric in a five-set thriller.
"It was a good day for the team as some favourites from the GC lost time too," said Van Aert.
Borhani made her international tournament debut in the 2009 Asian Club Championship. But the Iranian players face difficulties in the overseas leagues.
Though it was clear that Djokovic did not intend to hit the line judge, organizers said Djokovic was disqualified in accordance with the rules.
"This is down to a clear error on your behalf... This compensation will not be applied for the end of the contract by a unilateral decision by the player at the end of the 2019-2020 season," insisted Jorge Messi.
Barcelona insisted that he had to pay his 700-million-euro release clause.
The women's long jump event saw teenager Qin Huiling better her PB by three times to land the victory at 6.37m. Zeng Rui also renewed her life-time best to win the women's triple jump title at 14.10m, while Fang Yaoqing won the men's triple jump at 16.88m. Enditem
Third seed Williams essayed a signature comeback and served 12 aces to edge past her American compatriot Stephens 2-6, 6-2, 6-2 in one hour and 43 minutes.
"There's going to be a new Grand Slam champion. That's all I know right now. There's no past Grand Slam champions left in the draw," Zverev said.
However, he was very critical of Bartomeu, accusing him of "not keeping his word" and also criticizing the direction of the club in recent years.
"We hope that both sides can reach an agreement and everything can be made official," he told reporters at Ezeiza international airport. The former Porto midfielder said he was traveling to Miami for personal matters.