Roger Federer won’t lose any sleep over if Rafael Nadal may match his record 20 Grand Slam singles titles, according to his long-term coach Severin Luthi. The Spaniard claimed a 12th French Open title this year followed by the US Open that month to shut in to the 38-year-old Swiss. His latest success has re-energised the GOAT (greatest of all time) debate with Nadal, who’s 19 slams, awaiting his very best. Never behind Federer, who squandered two match points against Novak Djokovic in this year’s Wimbledon final has Nadal been just one Grand Slam name in his career. “No, I don’t think he stresses (about Nadal catching him up),” Swiss Luthi, who has toured with Federer because 2007. “He focuses on himself. He has a great deal of respect for Rafa and knows what it takes to win that lots of titles. “I don’t see him in any manner stressed. He will not be completely destroyed if Rafa gets the 20.” Luthi said tennis fans ought to savour viewing the two greats, rather than obsess about who is superior. “It is great for the fans. Especially the people who believed it was all over when Roger had 16 or 17 and Rafa had 14.” If Europe take on the Rest of the World federer and Nadal will combine forces this week. Read more: nhl tips for tonight games