Roger Federer doesn’t know a lot about his third-round opponent, #NextGenATP Norwegian Casper Ruud. In fact, he might know more about Christian Ruud, Casper’s father and coach who ended his career at the 2001 Roland Garros, the eighth Slam Federer played.

“I know probably more about his dad than about him. Even though I never played him, the father,” Federer said. “I know that [Casper has] improved a lot in recent years, and I think he plays very well on the clay. Again, I haven’t seen him play a whole lot. But for any 20-year-old to be on the big stage, playing a top guy, on a centre court, that’s what you dream of.”

Federer coasted into the third round on Wednesday as he continued his Roland Garros return without dropping a set 6-4, 6-3, 6-4 against Germany’s Oscar Otte.

The third-seeded Swiss, making his first appearance in Roland Garros since 2015, won 75 per cent of his service points, including the same percentage on his second offering, and was never challenged against the 25-year-old German, No. 144 in the ATP Rankings. Federer saved all four break points faced.

“I must say I feel really good, considering I haven’t played here in that long. Especially if I think back a few weeks and months ago before Madrid, didn’t know how successful I was going to play or how I was going to feel on the clay,” said Federer, who played in Madrid and Rome before Roland Garros.

“The clay-court season has been, it’s been busy, and it’s nice this way. So I hope I can keep it up. Next round is definitely going to be tougher.”

Read & Watch: Like Father, Like Son: Ruud Makes His Mark

Ruud made his first third round at a Grand Slam by beating Italy’s Matteo Berrettini 6-4, 7-5, 6-3. The 20-year-old Ruud, playing at a career-high No. 63, made the fourth round at the ATP Masters 1000 event in Rome earlier this month (l. to Del Potro) and improved to 13-5 on the season with the straight-sets win against Berrettini.

“Today, by the scoreline against Berrettini, seems like he did his work, and he deserves to be in the third round. I will take him very seriously,” Federer said.

Ruud has matched his Grand Slam win total this week and has yet to drop a set in beating Berrettini and 2014 semi-finalist Ernests Gulbis of Latvia.

“I didn’t kind of expect myself to win in three straight sets, but I played very good tennis when I had to the most, especially toward the end of both first and second set,” Ruud said of his second-round match.

“Now I’m playing one of the greatest champions ever of this sport on Friday, so I’m just super excited for it. I can play loose and free. I have nothing to stress about or think too much about.

“But of course I will be a bit excited and nervous, but I will just look at it as a great opportunity and a privilege to be able to play Roger.”

In other action, French wild card Nicolas Mahut, 37, beat Philipp Kohlschreiber 6-3, 6-3, 6-3 and will meet the winner of Argentine Leonardo Mayer and 17th seed Diego Schwartzman. Their match was suspended because of darkness with Mayer leading 4-6, 6-3, 6-4, 3-3.

“I was completely carefree. I could be carefree. I played my last weapons, and it was good. This is something that one can do when one is at the end of one’s career,” Mahut said. “I’m here now at the third round. It’s crazy. But that’s also the [Roland Garros] magic. French players can give their best. As every time when I was young, I would watch tennis on TV and I could see a French player playing in an outstanding way, and that’s never been my case. And I thought, ‘Oh my God, in 20 years I haven’t done it.’ And this year it’s happening. I’m very proud. I’m very happy.”

Third seeds Juan Sebastian Cabal and Robert Farah, making their first appearance since clinching the ATP Masters 1000 title at the Internazionali BNL d’Italia, opened their Roland Garros campaign on Wednesday with a 6-4, 6-4 win over Australians Matthew Ebden and John-Patrick Smith.

The Colombians also won the clay-court crown in April at the Barcelona Open Banc Sabadell (d. Murray/Soares), and improve to a 10-1 match record starting with that title run. Cabal and Farah will be looking to reach the quarter-finals or better for a third straight year in Paris.

Oliver Marach and Mate Pavic, the No. 4 seeds and returning finalists, defeated Jeevan Nedunchezhiyan and Mischa Zverev 7-6(2), 6-4 in their first-round match. The Austrian/Croatian duo also entered Paris on the heels of a successful title run, claiming their first trophy of the season last week in Geneva.

The other seeded duo in action Wednesday, No. 5 seeds Nikola Mektic and Franko Skugor, fell to Spaniards Pablo Cuevas and Feliciano Lopez 6-4, 4-6, 6-3. Mektic and Skugor had won the Rolex Monte-Carlo Masters title to start off the European clay swing, and were making their team’s debut at the clay-court major.

Cuevas and Lopez are both former Roland Garros doubles champions. Cuevas won here 11 years ago with Luis Horna, while Lopez teamed up with fellow Spaniard Marc Lopez to claim the title in 2016.

Serbian Dusan Lajovic swears he’s not addicted to coffee. With his morning breakfast, if he feels a little bit low on energy, the 30^th seed at Roland Garros usually has a short espresso, and around 4 or 5 p.m., he might savour a cappuccino, a little pick-me-up to avoid the mid-afternoon slump.

So about two coffees every day.

“Two… three… four… Sometimes but not every day,” Lajovic told ATPTour.com. “Let’s say two is a regular dose.

“But I’m trying to not overdue it.”

Who could fault him, though, for occasionally indulging? It’s good for business.

Lajovic, along with Serbian doubles player Nikola Cacic, co-founded and co-owns “Laboratorije Kafe”, or Coffee Lab, located about 25 metres from his front door in Belgrade, or, if it was at Roland Garros, about the distance between Court Philippe Chatrier and Court 1.

The café serves the usual coffees – espressos and cappuccinos – along with fresh juices, smoothies, bagels, cookies and ice cream. They import their coffee beans from Italy, after originally sourcing them from Colombia and Brazil, where a sweeter bean grows.

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“Now I would say it’s a little bit darker, and it’s similar to what people are used to in the country,” Lajovic said.

Most Serbians drink Turkish coffee, which has a more sour-tasting flavour, at home, Lajovic said, but the lab offers something a little different.

True to its name, the business also has a lab-like feel. It’s all black and white, and its smoothies come in beaker-like glassware. “We actually buy the glasses in the shop from the laboratories,” Lajovic said.

Initially, when he and Cacic founded the business about a few years ago, Lajovic envisioned it as the first in a future chain of shops. But even the most fledgling of tennis careers require full-time focus, and, for Lajovic, future growth forecasts for his main hustle have never looked more promising.

The Serbian reached his first ATP Tour final in April at the Rolex Monte-Carlo Masters, an ATP Masters 1000 event, beating Austrian Dominic Thiem (No. 5) and Daniil Medvedev of Russia (No. 14) to hit a career-high in the ATP Rankings of No. 23.

“He hasn’t surprised me with the level of tennis on clay, because I knew that he has the ability to play at a really high level,” said countryman Novak Djokovic, World No. 1 and 2016 Roland Garros champion.

“But to do it day after day at such a big tournament and to win against big players like Dominic Thiem is phenomenal, and I congratulate him for the great success… It’s great for Serbian tennis.”

At Roland Garros, Lajovic is seeded for the first time at a Grand Slam, a designation that has helped him avoid the likes of Roger Federer and Rafael Nadal in the first or second round.

In four of the past seven Grand Slams, Lajovic has faced a Top 5 player in the first two rounds.

“It’s a little bit of a relief,” Lajovic said. “Top 32 in a Grand Slam is something you’re always trying to do. When I broke into the Top 50, the next goal was to be seeded in a Grand Slam. Now I’m here, so I’m liking that I did those steps.

“I think every player is doubting about his goals and everything, so whenever you do something like that, it feels satisfactory.”

The 28-year-old credits coach Jose Perlas, who has worked with former No. 1s Carlos Moya and Juan Carlos Ferrero, along with Lajovic’s countryman Janko Tipsarevic, for the steady improvement. At the start of 2017, Lajovic was ranked No. 93.

“I’ve tried to become a little bit more aggressive, to be more dominant with the forehand… and try to use that as my weapon from all kinds of positions on the court,” Lajovic said.

In the past, for instance, if the ball came to his backhand side, he’d hit a backhand, and if it came to his forehand, he’d hit a forehand. He rarely diverted from those basics.

They’ve tweaked his fitness regimen as well, matching his workouts to his in-match movements.

“I understand him perfectly what he wants from me, he understands what I feel on the court. The connection is really good,” Lajovic said.

The Serbian should also feel good on the clay, and especially at Roland Garros, where he made his best Slam showing in 2014, reaching the Round of 16 before falling to Nadal.

Lajovic, however, doesn’t have to worry about facing the 11-time Roland Garros champion unless both reach the final.

The earliest time the Serbian could play a Top 5 player is in the third round, against fifth seed Alexander Zverev, which wouldn’t be until Saturday, or, in Lajovic’s language, at least three espressos and three cappuccinos from now.