Alexei Popyrin books all-Aussie clash in Paris after Stefanos Tsitsipas retirement

World No.3 Stefanos Tsitsipas retired from his second-round match at the Paris Masters against Australian Alexei Popyrin due to what appeared to be a right arm injury.

The 23-year-old Greek was trailing 4-2 during the first set on Wednesday (Thursday AEDT) when he called the trainer on court…