Catherine Bellis became the youngest player to win a U.S. Open match since 1996.
Team is seeking assurances from the Italian striker that he will abide by the code-of-conduct.
The former Microsoft CEO has made his debut as the new owner of the L.A. Clippers.
The defending champion has withdrawn from the competition after an injury to his right wrist.
New rule instituted after driver Kevin Ward was struck and killed during a race.
Talks come in the wake of an uproar caused by a two-game ban on Baltimore Ravens running back, Ray Rice.
Former Microsoft chief executive Steve Ballmer has purchased the Los Angeles Clippers for $2B after a court cleared the way for the sale.
An investigation has continued into the bizarre incident in which the U.S. stock car star struck and killed an up and coming driver.
The Northern Irishman is the third youngest player after Tiger Woods and Jack Nicklaus to win four of golf's biggest prizes.
Venus and Serena Williams made it through tough three-setters in the quarter-finals on Friday.
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