Raonic began 2015 by reaching the final at the Brisbane International after defeating No.
5 Nishikori in three sets, all decided in tiebreaks.
He lost to No.
2 Federer in three sets, with Federer recording his 1,000th match win on the professional tour.
Later in the month, he reached the quarterfinals of the Australian Open after beating No.
12 Feliciano López.
He lost to Djokovic in straight sets.

At the Indian Wells Masters, Raonic won his quarterfinal match against No.
3 Nadal, after saving three match points from Nadal in the second set tiebreak.
It was Raonic's first career victory over Nadal after five defeats.
He lost to Federer in the semifinals.

In April, Raonic opened the Monte-Carlo Masters with a victory over João Sousa.
Just one game into his second-round match against Tommy Robredo, Raonic called for a medical timeout due to a right foot injury.
Although he went on to win the match, Raonic's manager indicated that Raonic had made a pre-existing injury worse by playing.
In his quarterfinal match against Berdych, he complained of numbness in his right foot during a medical timeout, and retired while trailing 2–5 in the opening set.
It was diagnosed as a pinched nerve, and Raonic was expected to be healthy for the Madrid Open.

In Madrid, Raonic advanced to the quarterfinals with straight sets victories over Mónaco and Leonardo Mayer.
After Raonic lost in the quarterfinals against Murray, Murray observed that Raonic was "struggling [with injury]."
Following the match, Raonic announced that he would undergo surgery to repair a nerve in his foot, targeting a return in time for the French Open.
Ironically, Raonic's world ranking reached a new career-high of No.
4 the following week, the highest by a Canadian man or woman.

Following surgery, Raonic withdrew from the Italian Open and the French Open.
He returned in time for the grass court season.
 Having played in Halle in previous years, Raonic elected to play at the Queen's Club Championships for the first time.
 Raonic lost in the quarterfinals in his Queen's debut, and lost in the third round at Wimbledon.
After his Wimbledon loss to Kyrgios, Raonic commented that his foot injury had led to problems throughout his body: "There wasn't a place it wasn't [bothering me]... First ankle, then the hip, and then the back.
Then when those things aren't working, you just put too much pressure on your shoulder, and then your shoulder hurts."
The cascading injuries led to a withdrawal from Canada's Davis Cup tie against Belgium; a withdrawal from the Washington Open, where Raonic was the defending champion; first round losses at the Canadian Open and Cincinnati Masters; and a third round loss at the US Open to López.

In September, at the St. Petersburg Open, Raonic won his seventh singles title—and first in Europe—with a three-set victory over Sousa.
His serve was broken just once in the entire tournament.
After early losses at the China Open and Shanghai Masters, Raonic ended his ATP season by withdrawing from three consecutive tournaments, citing injury.
On November 2, he fell outside the top 10, dropping to No.
14.
After six weeks off, Raonic joined the Philippine Mavericks of the exhibition International Premier Tennis League (IPTL) in December.
After four matches, he withdrew due to back spasms.

In late November, Raonic parted ways with both Ljubičić, who had been his coach since June 2013, and Austin Nunn, who had been his media manager for nearly four years.
Ljubičić was added to Federer's coaching team two weeks later.
Raonic contacted former No.
1 tennis player Carlos Moyá about a coaching relationship, and they trained together and had discussions during the IPTL events.
The relationship was subsequently formalized and on January 1, 2016, Raonic announced that Moyá would join his coaching team alongside Piatti.
Raonic said that he chose Moyá for three reasons: "Carlos is very laid back and positive [... and] he communicates well."
Raonic began 2015 by reaching the final at the Brisbane International after defeating No. 5 Nishikori in three sets, all decided in tiebreaks. He lost to No. 2 Federer in three sets, with Federer recording his 1,000th match win on the professional tour. Later in the month, he reached the quarterfinals of the Australian Open after beating No. 12 Feliciano López. He lost to Djokovic in straight sets.
At the Indian Wells Masters, Raonic won his quarterfinal match against No. 3 Nadal, after saving three match points from Nadal in the second set tiebreak. It was Raonic's first career victory over Nadal after five defeats. He lost to Federer in the semifinals.
In April, Raonic opened the Monte-Carlo Masters with a victory over João Sousa. Just one game into his second-round match against Tommy Robredo, Raonic called for a medical timeout due to a right foot injury. Although he went on to win the match, Raonic's manager indicated that Raonic had made a pre-existing injury worse by playing. In his quarterfinal match against Berdych, he complained of numbness in his right foot during a medical timeout, and retired while trailing 2–5 in the opening set. It was diagnosed as a pinched nerve, and Raonic was expected to be healthy for the Madrid Open.
In Madrid, Raonic advanced to the quarterfinals with straight sets victories over Mónaco and Leonardo Mayer. After Raonic lost in the quarterfinals against Murray, Murray observed that Raonic was "struggling [with injury]." Following the match, Raonic announced that he would undergo surgery to repair a nerve in his foot, targeting a return in time for the French Open. Ironically, Raonic's world ranking reached a new career-high of No. 4 the following week, the highest by a Canadian man or woman.
Following surgery, Raonic withdrew from the Italian Open and the French Open. He returned in time for the grass court season.  Having played in Halle in previous years, Raonic elected to play at the Queen's Club Championships for the first time.  Raonic lost in the quarterfinals in his Queen's debut, and lost in the third round at Wimbledon. After his Wimbledon loss to Kyrgios, Raonic commented that his foot injury had led to problems throughout his body: "There wasn't a place it wasn't [bothering me]... First ankle, then the hip, and then the back. Then when those things aren't working, you just put too much pressure on your shoulder, and then your shoulder hurts." The cascading injuries led to a withdrawal from Canada's Davis Cup tie against Belgium; a withdrawal from the Washington Open, where Raonic was the defending champion; first round losses at the Canadian Open and Cincinnati Masters; and a third round loss at the US Open to López.
In September, at the St. Petersburg Open, Raonic won his seventh singles title—and first in Europe—with a three-set victory over Sousa. His serve was broken just once in the entire tournament. After early losses at the China Open and Shanghai Masters, Raonic ended his ATP season by withdrawing from three consecutive tournaments, citing injury. On November 2, he fell outside the top 10, dropping to No. 14. After six weeks off, Raonic joined the Philippine Mavericks of the exhibition International Premier Tennis League (IPTL) in December. After four matches, he withdrew due to back spasms.
In late November, Raonic parted ways with both Ljubičić, who had been his coach since June 2013, and Austin Nunn, who had been his media manager for nearly four years. Ljubičić was added to Federer's coaching team two weeks later. Raonic contacted former No. 1 tennis player Carlos Moyá about a coaching relationship, and they trained together and had discussions during the IPTL events. The relationship was subsequently formalized and on January 1, 2016, Raonic announced that Moyá would join his coaching team alongside Piatti. Raonic said that he chose Moyá for three reasons: "Carlos is very laid back and positive [... and] he communicates well."
Milos Raonic