Will we see a Raonic revolution, or will his body betray him first?

World No. 4 Milos Raonic has had a solid start to his 2017 campaign, having reached at least the quarterfinals in his first three tournaments of the year.

However, there’s a strong chance his results could have been even better had his body not betrayed him at the most inopportune times.

Just last week, he had to withdraw before the final in Delray Beach with a leg injury. This came a day after beating the always-dangerous Juan Martin del Potro in the semifinals. And at the Australian Open last month, Raonic was battling a leg issue in his quarterfinal match against Rafael Nadal and went down in straight sets.

Raonic's health woes even had an indirect impact on the way the rankings shaked out at the end of last year. Andy Murray needed to win their semifinal match at the Paris Masters to reach No. 1 for the first time in his career. He did, by way of walkover, as Raonic was unable to play.

Unfortunately, that’s been an underlying theme throughout his career.

Raonic exploded onto the scene with an ascent nearly as rapid as one of his first serves. In 2011, the Canadian won his first career title in San Jose, defeating Fernando Verdasco—who was ranked No. 9 at the time—in the final.

A week later, he made the final in Memphis. Those two results—combined with an earlier fourth-round showing at the Australian Open earlier that year—lifted his ranking more than a hundred spots in only a couple of months' time. He finished that season within the Top 30, and less than two years later he made his Top 10 debut after reaching the final of the 2013 Rogers Cup.

Raonic’s upward trend continued the following year, as he made his first French Open quarterfinal and Wimbledon semifinal, and won his maiden 500-level tournament in Washington.

In 2015, a variety of injuries really began to creep in as he missed the majority of the clay-court season and suffered early losses on grass. Raonic’s hard-court season was no better, as he fell early in the two Masters 1000 summer events and lost in the third round at the U.S. Open. He withdrew from three tournaments in the fall and finished outside of the Top 10.

Last year, though, his season got off to a near-perfect start. He won the title in Brisbane before reaching the semifinals at the Australian Open, where he lost to Murray. Once again, his health let him down: He was up two sets to one before becoming undone by an injury.

As a testament to his pure ability, in his first tournament back after taking time off to heal, he reached the final in Indian Wells, losing to Novak Djokovic. Shortly after returning to the Top 10—and putting together a solid enough clay-court season—it was on grass where he made his biggest move. Raonic reached his first Slam final at Wimbledon after defeating Roger Federer in a five-set epic.

He lost to Murray in straight sets in the final. Despite his major breakthrough, Raonic wasn’t able to sustain that momentum through the rest of the year. Ryan Harrison defeated him in the second round of the U.S. Open, and his tournaments thereafter were full of frustration. An ankle injury, then a quadriceps tear in Paris, were the main culprits.

Raonic was able to play the ATP World Tour Finals, and reached the semifinals before falling to Murray in a third-set tiebreaker. That result lifted him to No. 3 in the world, a career high.

He’s more than held his own against the majority of his peers, but beating the Big Four has never come easy: He’s a combined 8-33 against the future Hall of Famers. But as noted, there have been instances where the Canadian hasn’t been at full strength, or even been able to play the match.

Raonic has never been shy about letting his career ambitions be known, and is willing to do whatever it takes to achieve them. Nowhere has this been more evident than in his numerous coaching changes over the years. He's gone from Galo Blanco to Ivan Ljubicic to Carlos Moya; added on "consultants" like John McEnroe; and is now working with 1996 Wimbledon champion Richard Krajicek.

The jury's still out on Krajicek, but with his prior coaches, Raonic always saw measurable gains. At some point, though, he gets to a point where he's looking for more and moves on. It contradicts the stability seen in the Toni Nadal-Rafa partnership, or with Djokovic and Marian Vajda.

It's hard to argue against the results Raonic has put up, though. And making multiple changes to your team isn't without precedent: As he started solidifying his place in the Top 10, Djokovic made tweaks to his coaching team to help with certain aspects of his game, such as bringing in doubles great Mark Woodforde to help him with his volleys.

Raonic is firmly focused on reaching the top spot, and his combination of desire and talent would make it seem like an ever higher ascent is inevitable.

But aside from the great depth of players he's facing, his own body is proving to be an equally staunch opponent.