World number two Roger Federer and defending champion Stan Wawrinka both suffered third-round defeats at the Monte Carlo Masters. World number nine Wawrinka, the 2014 Australian Open champion, beat fellow Swiss Federer last year to win his first and only Masters 1000 title. But he lost 6-1 6-2 to Bulgaria’s world number 11 Dimitrov in 54 minutes. Second seed Federer was beaten 6-4 7-6 (7-5) by Frenchman Gael Monfils, the world number 18 and 14th seed. It was a second consecutive win on clay for Monfils over the 17-time Grand Slam champion after his straight sets victory during last year’s Davis Cup final. Federer, 33, four times a beaten finalist in this event, was competing for the first time since losing to Novak Djokovic in the Indian Wells final nearly four weeks ago. He was broken in the ninth game of the first set and then squandered a 5-3 lead in the second set tie-break, losing four successive points. Wawrinka had won two of the previous three meetings with Dimitrov, including a clay court encounter at the 2013 World Tour Masters in Madrid. But the 30-year-old Swiss made 41 unforced errors and had just four winners against the ninth seed. He was guilty of 13 of those unforced errors as Dimitrov raced 4-0 ahead, and failed to convert four break points in the sixth game of the second set.