Reuters 2 minute read Tennis - Australian Open - Quarter Final - Melbourne Park, Melbourne, Australia - January 28, 2020. Serbia's Novak Djokovic reacts after his match against Canada's Milos Raonic as he is interviewed by former tennis player John McEnroe. REUTERS/Hannah Mckay LONDON, July 12 (Reuters) - Novak Djokovic's ability to play his best tennis under pressure can help him win at least five more Grand Slam titles, John McEnroe said after the world No.1 tied Roger Federer and Rafa Nadal's record with his 20th major at Wimbledon on Sunday. The 34-year-old Serb beat Italian seventh seed Matteo Berrettini 6-7(4) 6-4 6-4 6-3 in the final and McEnroe, a seven-times major winner, told the BBC he was "playing better than he's ever played".