Switzerland's Roger Federer announced on Friday that it will not be able to compete in the Masters 1000 Montreal, which starts next Monday because of back pain.
"I'm disappointed not to play in Montreal next week," Federer published on their Facebook social network page.
The last time the Swiss entered the court on the last day was July 25 tournament in Gstaad, in his home country when he was knocked out in the debut by German Daniel Brands. On occasion, the Swiss 31 years had revealed suffer "serious back problems."
The former world number one, who dropped to the fifth position of the ATP rankings, had bad results in recent weeks, with the elimination in the second round of Wimbledon, a tournament he had won for the seventh time in the past year.
On Wednesday, the Frenchman Jo-Wilfried Tsonga, the world number eight, also withdrew from the tournament in Montreal because of knee pain.
Both are expected to reach 100% in the U.S. Open, which begins on August 26.

Brazil beats Argentina and wins 24th South American title.
On Sunday night, the Brazilian team won the women's basketball title South American tournament played in Mendoza (ARG), to overcome Argentina, host nation, by the score 67-58.
Brazil was in the dressing room at halftime, losing by one point difference (36-35), but a great reaction from the coach Luiz Augusto controlled Zanon in the third quarter, won by Selection by partial 22-10, opened the path to victory. In the last quarter, even with a partial defeat by 12-10, the Brazilian team confirmed the victory and the title.
In the third quarter, the wing Jaqueline Silvestre ended up injured and had to leave the court charged.
The scorer of the match was the playmaker Taina's Passion, which left the court with 19 points, plus five rebounds and two assists. The pivot Damiris Amaral also had a prominent role and closed with double-double of 18 points and 11 rebounds.


Marriage took place in Porto das Dunas, where is the Beach Park. The two took the relationship on July 10.
A month after taking the relationship, Lili, beach volleyball player and Larissa France, former athlete of the sport, and bronze medalist in London, were married on the beach of Porto das Dunas, Fortaleza, where is located the Beach Park .
The photos were posted on Facebook marriage Lili, with both wearing white dress and holding bouquets. They have been together for over two years, but only confessed the union last month when Larissa posted on the internet a declaration of love to his mate on the anniversary of dating them, July 10:
- Today is our day, passion! Wonderful and unforgettable moments! God is wonderful to me, I thank him every day for giving me you. We live, learn, grow, play, smile ... And the most important is that in all those moments you were with me. Love you more each day and am very proud to be his girlfriend. You're wonderful! If you care for me, okay? Kisses.

In Campinas, Brazil received the U.S. in an exciting game for the Grand Prix in 2013.
Sunday morning, 4, Brazil faced the U.S., its biggest rival in volleyball. After three consecutive finals in the Grand Prix, with all defeats, Brazil went all out for the game towards the title and breach of a nuisance fasting. In turn, got the win by 3 sets to 1 in Campinas.
Playing at home, the double Olympic champion team started well, but as the selection of the other side is the same technical level of green and yellow match was very balanced. The U.S. team got a small three-point lead in the first set, making 15-12. With some complaints regarding withdrawals from opponents, José Roberto was restless. Then the rival team was able to open a good lead of six points, making 20-14. The crowd pushed Selection Campina Grande, Brazil was still disorganized but the pass was not good. The U.S. closed the first set 25-17, silencing the gym Campinas.
Montezemolo back to snipe Alonso: "Pilots come and go"
Leader, who had criticized the Spanish after the Hungarian Grand Prix, points out that the priority is Ferrari.
The honeymoon honeymoon between Fernando Alonso and Ferrari does seem to have come to an end. After criticizing the pilot last week, team president Luca di Montezemolo returned to condemn claims of the Spanish over the yield of the car.
"Fernando gave us a lot in recent years and his disappointment at not being so competitive is understandable. But I did not like some words, attitudes and explosions, "said the official site of the Scuderia. Montezemolo explained why the harsh words against the double world champion.

Thomas Müller shines and runs over Bayern in the German Cup. See the goals!
Pep Guardiola's team easily passed by modest Rehden.
Bayern Munich debuted with a stunning victory by 5-0 in the edition 2013/14 of the German Cup. With full force, the defending champion of the tournament took no notice of the small Rehden and is now preparing to debut at the German Championships on Saturday, against Borussia Monchengladbach.
The impetus of the Bayern did not decrease after the break and Thomas Müller scored his second goal converting a penalty kick suffered by himself. It was also the casing 25 the fourth goal Bayern's head again.
To close the scoring, Müller did the fourth goal, but it was the pass to Robben, who face-to-face with the goalkeeper struck the corner.

Messi wants to wage revision because of Neymar, says Catalan newspaper.
Argentine would again become the highest-paid team.
Lionel Messi would request a meeting with the board of Barcelona to revise their salary after the arrival of Neymar to the club. According to Jordi Suffice columnist Catalan newspaper 'El 9 Esportiu', Jorge Messi, Lionel's father, would like to meet with Sandro Rosell, president of the club to renegotiate the contract of his son.
The Brazilian would become the highest paid player of Barça, which did not please Messi and his father, who wanted her son, playmaker of the team on and off the pitch, was also the highest paid in economic terms. Therefore, the player will have to renegotiate his contract to increase his salary to go back to being the highest paid of Barcelona.
However, according to the newspaper Mundo Deportivo, Messi and his family denied any desire to renegotiate the contract, since the Argentine renewed in February this year, 2018 with the blaugrana team, with a release clause of € 250 million .
The first end of the two superstars together will be the Spanish Super Cup, the Sports Interactive transmits exclusively.
by:Leonardo and Rodrigo