Milos Raonic lost in the fourth round of the French Open, but the Canadian certainly made waves during his stay in Paris. TSN's Mark Masters has a look at what we learned about the 25-year-old this year at Milos Raonic.

1. Raonic is the CEO

The decision to add John McEnroe to his coaching staff was surprising on a number of levels. For one, Raonic already has a coach — two, actually. Riccardo Piatti has been with Raonic for years while Carlos Moya, like McEnroe a former world No. 1, joined the crew in January. So, how will everything fit together?  

"At the end of the day, every coach I have is to some extent an advisor and it is my job personally, out of everything I hear, to weigh what it's worth and weigh what is best for me. I'm the CEO of the Milos Raonic Tennis. That's it. I take everybody's consultations very personally. I know everybody I have around me wants to help me to the fullest."

Piatti is handling much of the training and the technical side of things and actually left Paris early in the French Open. Moya is expected to help Raonic mostly in and around the Grand Slams.

"I work very hard, and it's going to be about putting the things together right," Raonic said. 

2. Is McEnroe the missing piece?

Raonic has never made a Grand Slam final, but seems to be getting closer. At the Australian Open he was on the cusp of beating Andy Murray in the semi-finals before an injury derailed his chances. It was his second trip to the final four at a major. In 2014 at Wimbledon, the other appearance, he lost in straight sets against Roger Federer.

"It's a great honour," Raonic said when asked about McEnroe agreeing to help. "There's a lot I want to achieve. I feel like I'm a lot closer and I'm going to try to do everything I can to sort of maximize that myself and maximize giving myself that opportunity to achieve those goals."

Here is how Raonic stacks up against his top rivals, which may explain why he feels like he needs an extra push:

Novak Djokovic 0-7 (last meeting: lost 3-6, 4-6 in Madrid, 2016)
Murray 3-5 (last meeting: lost 2-6, 0-6 in Monaco, 2016)
Federer 2-9 (last meeting: won 6-4, 6-4 in Brisbane, 2016)
Stan Wawrinka 1-4 (last meeting: won 6-4, 6-3, 5-7, 4-6, 6-3 at Australian Open, 2016)
Rafael Nadal 1-6 (last meeting: lost 3-6, 6-7 in Shanghai, 2015)
Kei Nishikori 2-5 (last meeting: lost 6-3, 3-6, 4-6, 6-2, 4-6 in Davis Cup, 2015)

3. Bringing McEnroe on board isn't just about the grass-court season

Right now, the plan is for McEnroe to work with Raonic during the grass-court season and then consult during Wimbledon where he will also be busy working as a television commentator. But, both Raonic and McEnroe have hinted that, should they mesh well, the relationship could continue. 

"I was sort of just looking for another set of eyes to be a bit more efficient on grass and I think people are seeing it as just plain focus on grass, that's what it's far from," Raonic said. "It's about generally improving. I want to improve coming forward and I want to improve putting more pressure on my opponents."

In general, it feels like Raonic has stalled a bit since that brilliant start to the season, which saw him win Brisbane and make a spirited run in Melbourne. McEnroe is a high-energy guy and could provide a spark. 

"I feel like I was a lot more efficient at the beginning of the year coming forward, and it's something that I would like to put a lot of attention to," Raonic said. "And it just works out with grass that's probably [where it] will benefit me the most. And now there is going to be the three weeks leading to Wimbledon that we are going to work, and really put some attention to that and just find that sort of groove, that efficiency."

As for McEnroe, he cautioned that it can be hard to make a huge difference in a short time. 

"I'm hoping this is not a one-shot thing," McEnroe told Christopher Clarey of the New York Times. "I think it would be incredibly difficult to make an impact that quickly. I think it’s a process."

4. But it sort of is about the grass-court season

Raonic made the semi-finals at Wimbledon in 2014, but other than that he has struggled on the hallowed lawns of the All England Club. He has lost in the second round three times and in the third round last year. Raonic's record is actually better on clay than on grass.  

"It doesn't seem like he's been able to do as well as certainly someone with his game could do, and I think he could win it," McEnroe told the Times. "Hopefully I can add that little bit and give him a little bit better understanding of how to take advantage of his attributes, his size. He's a big strong, great, dedicated and smart kid."

5. Injury questions linger

It is becoming an unwelcome trend for Raonic: injuries popping up at the worst possible time. In Australia, it was a right adductor issue in the semi-finals. At last year's U.S. Open, back spasms contributed to an early exit. At Wimbledon last year, Raonic rushed back from foot surgery and wasn’t 100 per cent. That surgery forced him to miss the 2015 French Open altogether.

Left wrist inflammation almost forced him to withdraw from the tournament in Rome three weeks ago before his loss to Nick Kyrgios.   

At this year's French Open, Raonic required a medical timeout to deal with a left hip problem during his third-round match. He insisted the injury did not impact him during a fourth-round loss.

"I don't think it really had any effect," he insisted. "Going forward, it's not on my mind at all."

Raonic is scheduled to play one event between now and Wimbledon, at the Queen's Club, and was asked if he'll consider adding another grass-court tune-up event to his schedule.

"No, my body doesn't handle probably more than two weeks in a row," he admitted. "Let's just keep it on [the planned schedule] and let's spend time on the [practice] court."

6. Slump or surface?

Raonic arrived in Paris ranked No. 9 in the world and his opponent in the fourth round of the French Open was Albert Ramos-Vinolas, ranked 55th. And yet, Raonic lost in straight sets. It was a surprising result, to say the least.

Afterwards, it was suggested to Raonic that the slow, damp and cool conditions did not favour him. If he could've chosen, he probably would've picked a hotter day.

"But I couldn't really pick," Raonic said flatly. "If the sun is out it's always a better conditions for me. It's slower and heavier conditions, but it's me facing the exact same thing he's facing. Who does that benefit? Obviously that's up for interpretation, but I had a simple task out there to try to find a way to win and I wasn't able to find that today."

Raonic's loss shows just how vulnerable he is when his serve isn't a big weapon.

"I have to say I'm disappointed I lost. I think the main reason I lost was because the foundation of my game wasn't there. I didn't serve well. I think when I look back, probably at a stat sheet, my numbers were probably pretty poor when it comes down to that."

Raonic's serving numbers declined in each round of the tournament. In the first round, he won a whopping 93 per cent of his first-serve points and 63 per cent of his second-serve points. In the fourth round, he won 63 per cent of his first-serve points and only 47 per cent of his second-serve points.

"I gave myself opportunities on his serve (seven break points), but the day is a lot easier for the other guy when I don't serve well," Raonic said.

7. The French Open was a big disappointment 

Raonic didn't play at Roland Garros last year so he had no points to defend this time around. As a result, his ranking may actually go up by virtue of his round-of-16 run. Nonetheless, there's no sugarcoating what happened. 

Before the tournament, Raonic had high hopes. "I'm picking up some momentum," he said, noting that he was finally close to his level at the Australian Open.

Raonic eased through the first three rounds at Roland Garros winning all nine sets. On paper, he was a huge favourite against Ramos-Vinolas. He had a better clay-court record than the Spaniard and much more experience at this stage of a slam. Ramos-Vinolas had had won just four matches in 18 previous appearances in majors. 

"He played well," Raonic said. "He's doing things well. He's having, for sure, the best week he's had on tour, and he's doing things well. He's moving the ball around well. He's playing deep. He's personally moving well. He did things quite efficiently today."

The loss deprived Raonic the chance to face Wawrinka, the defending French Open champion, in the quarterfinals. At this stage of his career, every time Raonic gets to go up against a top player on the biggest stage it is valuable experience whether he wins or loses. 

Plus, he beat Wawrinka at the Australian Open, which would've given him a sense of confidence. And with Federer and Nadal out of the competition due to injury and Djokovic and Murray on the other side of the draw, Raonic seemed to have a plausible path to the finals. Alas, it was not meant to be.

8. Look for Raonic to be even more aggressive 

The conditions in Paris perhaps made it difficult for Raonic to assert his will on the proceedings, but on grass and hard courts he can ratchet up the attack. 

"I think this tournament in general I played definitely way too passive and I let the other guys dictate too much," Raonic said. "I counted on sort of scrapping and fighting to get myself through, which was enough [early], but it wasn't enough [against Ramos-Vinolas]. So I fought as hard as I could. That's probably the thing I will be the most proud about, but now it's just about sort of resetting and putting the attention on what matters most and move forward.

"I think if I am looking to give myself the best chance possible to win a Grand Slam, if not more than that, I must take care of my serve. If I can constantly put pressure and find a way forward, make the guys sort of think, I can give myself a good opportunity."

9. Raonic is underrated ... and has terrible handwriting  

In an ESPN poll of 31 players released on the eve of the French Open, one of the questions posed was, "Who is the most underrated player right now?" David Ferrer came in first, Dominic Thiem second and Raonic tied for third.   

Raonic thinks he should be a bit higher on the list. 

In a post on the Players' Tribune, Raonic filled in a survey. Asked the same question – The most underrated player in tennis is… Raonic wrote, "Me."

10. Raonic not worried about Rio

During the French Open, players have been peppered with questions about the upcoming Olympics in Rio. Some have said they aren't interested in playing, because the event offers no ranking points or prize money and falls in the middle of the busy hard-court season. Among those not making the trip to the first ever Olympics in South America are John Isner, Kevin Anderson, Feliciano Lopez, Bernard Tomic and Dominic Thiem.

Raonic doesn't share that sentiment. 

"Points or no points, it doesn't really matter," he said. "I think the goal and the target is very simple, and you're there to win a medal — the shinier the better."