Summary of sports events and persons who made news on Thursday IMAGE: Switzerland’s Roger Federer reacts. Photograph: Andrew Couldridge/Reuters Roger Federer said beating Greek youngster Stefanos Tsitsipas in Thursday’s Hopman Cup clash felt like a win over his son but the joke may well serve as a reminder of his powers as the Swiss prepares to defend his Australian Open crown this month. The 37-year-old survived an early scare before outperforming Tsitsipas, 17 years his junior, during a 7-6(5) 7-6(4) victory that sent Switzerland into Saturday’s title clash against Australia or Germany. Victory gave world number three Federer, the oldest player in the top 10, three wins from three singles matches in Perth as he geared up for the season’s first Grand Slam as a favourite alongside Novak Djokovic, Rafael Nadal and Alexander Zverev. “He could be my son,” 20-times major winner Federer joked about the age between him and Tsitsipas, before praising the world number 15. “He did a nice job. I think we both played well without too many mistakes. I learned about his game. From my game, I didn’t learn anything. “For me, it’s about maintaining a good level of play. I’m happy where my game is…