Roger Federer has issued a firm message to Lleyton Hewitt’s 17-year-old son Cruz, after he was caught flirting with his twin daughters earlier this year. Last month it was reported that Cruz was getting very close to Roger’s daughter Myla, 17, and her twin sister Charlene, and was considering moving to Switzerland to both be closer to them and advance his budding tennis career.Now the 45-year-old former world champion has reportedly sat down with the teenage tennis prodigy to offer some straightforward advice about what it will take to reach the very top of the sport.’Roger truly believes Cruz has got the potential to go all the way in the years ahead,’ an insider recently told New Idea magazine.’And it’s a two-way street, everyone knows how much respect Cruz has for Roger and that he looks up to him alongside his dad as a true legend of the game, if not the undisputed GOAT.’They added that Federer had imparted to Cruz the importance of keeping his eyes firmly on the prize, with tennis training needing to remain his ‘main focus’ – and anything that could take his attention away from the court best kept firmly in check. Roger Federer has issued a firm message to Lleyton Hewitt’s 17-year-old son Cruz, after he was caught flirting with his twin daughters earlier this year’The pressure can be enormous, Roger’s candid about that. Even with all his success, Roger would have done certain things a little differently. He’s humble enough to share those guidelines with Cruz, he sees him as a true superstar in the making,’ they said.’But he’s not sugarcoating some of his advice, as he truly believes that sacrifices are the name of the game. For all the talent in the world, Cruz is going to need to grit his teeth and buckle down if he wants to get to the top and stay there.’And while Federer is said to be firmly in Cruz’s corner, his message appears to be clear: with a potentially glittering tennis career ahead of him, the teenager has to keep his eyes on the game. Cruz is an emerging star in the professional tennis world and currently holds a career-high ATP singles ranking of No. 354. Last month, Cruz was spotted looking very cosy with Federer’s daughter Myla as they watched the US Open in New York. The teenagers were seated next to each other in the stands, giggling and smiling as they chatted and looked at something on each other’s phones. Looking very at ease in each other’s company, the pair leaned in as they shared a friendly moment.Cruz, Myla and Charlene have been spotted together on several occasions in recent months, including at the Australian Open in January, where he was seen sitting alongside the sisters in the stands. Last month it was reported that Cruz was getting very close to Roger’s daughter Myla and her twin sister Charlene, and was considering moving to Switzerland to both be closer to them and advance his budding tennis career Now the 45-year-old former world champion has reportedly sat down with the teenage tennis prodigy to offer some straightforward advice about what it will take to reach the very top of the sport. (Pictured with Cruz in 2014)And the friendship appeared to be going strong at Wimbledon, when Cruz was spotted enthusiastically greeting the twins as he arrived for the junior boys’ final. The trio’s appearances together have led to plenty of interest given their extraordinary sporting pedigrees, sparking rumours that Cruz and Myla may be an item.’It makes sense that they would at least be mates. Cruz has always been close to Myla and her twin,’ an insider recently told Woman’s Day. ‘If they are really an item, then for both sets of parents, it would be a relief of sorts because they each know that they have grown up together with very similar values.’ The twins live with their father in Switzerland and Cruz is reportedly eyeing a move there.However, his parents Lleyton, 45, and Bec, 43, are reportedly wary about him moving abroad, fearing ‘distractions’ could take his mind off of tennis training.The couple have three children: daughters Mia, 20, and Ava, 15, as well as son Cruz.