Serena Williams' rumoured boyfriend Drake was among the U.S. Open crowdmembers who were left stunned on Friday (11Sep15) when the women's world number one crashed out of the New York tennis championships in a devastating loss to unseeded Italian Roberta Vinci. The American fell to defeat in a three-set thriller, ending the sports star's bid to make history with the first calendar Grand Slam since Steffi Graf achieved the feat in 1988.