Rafael Nadal led the stars who quickly took to social media Sunday to congratulate Novak Djokovic on winning his record-breaking 23rd major title at Roland Garros.

“Many congrats on this amazing achievement @DjokerNole,” Nadal wrote. “23 is a number that just a few years back was imposible to think about, and you made it! Enjoy it with your family and team!”

Many congrats on this amazing achievement @DjokerNole
23 is a number that just a few years back was imposible to think about, and you made it!
Enjoy it with your family and team! 👏🏻

— Rafa Nadal (@RafaelNadal) June 11, 2023

Djokovic is also halfway to completing the Grand Slam by winning all four majors in the same season. The last man who accomplished that feat, Rod Laver (1962 and 1969), also shared his praise for the Serbian.

Congratulations on winning 23 majors @DjokerNole and cementing your legacy in another command performance at Roland Garros. Your skill and unwavering mental fortitude on all surfaces is astonishing. Kudos to Casper Ruud, who valiantly pushed this great champion all the way. 🚀 https://t.co/vY003Jj6Iu

— Rod Laver (@rodlaver) June 11, 2023

Plenty of other stars also shared their thoughts on social media.

Congratulations @DjokerNole!💪🏼💪🏼🇫🇷

— Iga Świątek (@iga_swiatek) June 11, 2023

What a champion 🏆
Idemo Nole 🙌#rolandgarros @DjokerNole https://t.co/G0TMgQLdBG

— Juan M. del Potro (@delpotrojuan) June 11, 2023

Congratulations to @DjokerNole on winning the #rolandgarros Men’s Singles title for the third time. He now has a record 23 Grand Slam tournament singles titles. 👏 https://t.co/Td0DH2vboa

— Billie Jean King (@BillieJeanKing) June 11, 2023

Novak Djokovic is GOAT

— Kafelnikov Yevgeny (@KYevgeni) June 11, 2023

Unreal @DjokerNole
The greatest mental strength of any athlete ever seen

— victoria azarenka (@vika7) June 11, 2023

And @DjokerNole stands alone as a man (Serena) with 23….

Absolutely EPIC

And he is far from done

— Patrick McEnroe (@PatrickMcEnroe) June 11, 2023

The 2023 grass season kicks off this week on the ATP Tour as ‘s-Hertogenbosch and Stuttgart each host an ATP 250 event from 12-18 June.

Daniil Medvedev headlines the draw at the Libema Open, where he reached the championship match last year, with Jannik Sinner among his rivals in the Netherlands. At the BOSS OPEN, top seed Stefanos Tsitsipas and the returning Nick Kyrgios are among those seeking to deny Matteo Berrettini emerging from the field to seal his third Stuttgart crown.

ATPTour.com looks ahead at five things to watch at each event.

FIVE THINGS TO WATCH IN ‘S-HERTOGENBOSCH
1) Medvedev Eyes Fast Start On Grass: After sealing a clay-court breakthrough with his maiden title on that surface in Rome, Medvedev seeks to transfer his renowned hard-court prowess to the grass at the Libema Open. In 2022, the 27-year-old reached the final in ‘s-Hertogenbosch before he was undone by surprise home winner Tim van Rijthoven. Can the World No. 2 go one step further this year?

2) Second Seed Sinner: Sinner remains relatively inexperienced on grass, having played only nine tour-level matches on the surface, but his run to the Wimbledon quarter-finals last year showed the Italian has plenty of grass-court potential. He returns to ‘s-Hertogenbosch for the first time since 2019, when he suffered a first-round defeat as a qualifier.

3) Home Favourite To Rule Again?: With reigning champion Van Rijthoven and the No. 1-Dutch player in the Pepperstone ATP Rankings, Botic van de Zandschulp, both absent due to injury, Tallon Griekspoor spearheads the home charge in ‘s-Hertogenbosch. The World No. 39 is seeded sixth for his third appearance at the event, where Richard Krajicek and Sjeng Schalken are the other Dutchmen to have triumphed.

4) Raonic Returns: The former World No. 3 Milos Raonic competes for the first time since July 2021 after a series of injury issues. The 32-year-old Canadian, who reached the Wimbledon final in 2016, takes on Serbian fifth seed Miomir Kecmanovic in his comeback match.

5) Koolhof/Skupski Defend Title: Wesley Koolhof and Neal Skupski lead the doubles field in ‘s-Hertogenbosch, where the Dutch-British pairing seeks to defend its 2022 crown. The top seeds’ rivals as they chase a first title of the year include second seeds Marcelo Arevalo/Jean-Julien Rojer and Australian Open champions Rinky Hijikata/Jason Kubler.

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FIVE THINGS TO WATCH IN STUTTGART
1) Tsitsipas Top Seed: The World No. 5 Tsitsipas returns for a second appearance at the BOSS OPEN, where the Greek is chasing his first title of 2023. A quarter-finalist last year on event debut, the Greek will hope to build on a solid European clay-court swing during which he reached at least the last eight at all five events he played.

2) Berrettini Targets Stuttgart Hat-trick: The seventh-seeded Berrettini seeks to maintain his unbeaten record in Stuttgart. The 27-year-old, who missed Roland Garros due to injury, lifted the title on both his previous appearances in south-west Germany (2019 and 2022). Last year, he battled to three of his four victories in three sets, including the championship match against Andy Murray.

3) Kyrgios Comeback: The World No. 26 Kyrgios competes in singles for the first time since Tokyo last October. The 28-year-old, a two-time semi-finalist in Stuttgart, went 12-3 on grass in 2022, including a run to his maiden major final at Wimbledon. The Australian faces Chinese star Wu Yibing, playing his first professional match on grass, in the first round.

4) Grass Court Threats: Like Kyrgios, Taylor Fritz and Hubert Hurkacz enjoyed success on the grass in 2022. The World No. 8 Fritz, a two-time ATP Tour champion on the surface (Eastbourne 2019, 2022) is the second seed for his first appearance in Stuttgart since 2018. Hurkacz, who is chasing his first match win in three appearances at the event, won his maiden ATP 500 title on grass in Halle last year.

5) Ebden/Bopanna Top Seeds: Matthew Ebden competes on grass for the first time since he lifted the 2022 Wimbledon title alongside Max Purcell. The Australian and his partner Rohan Bopanna are the top seeds in Stuttgart. where Nikola Mektic and Mate Pavic are the second seeds: The latter is defending his title in Germany after he triumphed alongside Hurkacz a year ago.

Andy Murray advanced to the Surbiton Challenger final Saturday after he ousted defending champion Jordan Thompson 7-6(5), 6-3 in the last four.

The Scot found rhythm from the start, jumping out to an early 3-0 lead. The Australian fought back to force a tie-break but Murray’s consistency and all-court coverage helped him move past Thompson in straight sets.

Despite serving for the match at 5-2, Murray was broken before closing out the semi-final in the following game to set a clash against Austrian Jurij Rodionov.

Second seed Murray is aiming for his second Challenger title of the year after he triumphed at last month’s ATP Challenger Tour 175 event in Aix-en-Provence, France, where he defeated Tommy Paul in the final.

Should the 36-year-old Murray be crowned champion, he would become the oldest grass-court winner in Challenger history (since 1978). He is bidding to become just the sixth player to win Challenger titles on both clay and grass in the same season.

World No. 134 Rodionov defeated Belgian Zizou Bergs 6-2, 6-4 after winning 25 of 30 first-serve points.

Rodionov, who is a six-time Challenger champion, has not dropped a set this week and will aim for his first title on grass. The 24-year-old would become the first Austrian to win a Challenger title on grass.

Last season, Murray defeated Rodionov 6-2, 6-4 on the same court they will meet on Sunday afternoon.

The Surbiton Challenger final between Murray and Rodionov, which will be held not before 2 p.m. local time, can be streamed for free on Challenger TV.

It has been a long seven months, but Nick Kyrgios is ready and raring to go once again on the ATP Tour.

The Australian competes as the eighth seed next week at the BOSS OPEN in Stuttgart, where he is set to play his first singles match since last October in Tokyo. The 28-year-old played in the doubles at the 2022 Nitto ATP Finals alongside Thanasi Kokkinakis, but has not competed this season after undergoing surgery to repair a small tear in his left lateral meniscus in January.

“I wouldn’t say it was major surgery, but I had quite a serious surgery on my knee” said Kyrgios on Saturday in Stuttgart, where he is a two-time semi-finalist. “It’s taken me about five months to get back to even playing, moving and [ready to play] against these players.

“It’s been difficult, but at times it’s been amazing just to be home with my family. Tennis is a sport where you travel so much of the year and being home, for me, was important. But seeing everyone [else] play wasn’t easy at times. I’m just super excited that my knee is a bit better and I’m able to play now.”

Kyrgios enjoyed the best season of his career in 2022, when he racked up a 37-10 record, including a Tour-leading 12 wins on grass. The World No. 28, who reached his maiden major final at last year’s Wimbledon, hopes to pick up where he left off on the surface as he prepares for a first-round clash against Wu Yibing in Stuttgart.

“The grass season for me is always the best part of the year,” said Kyrgios on Saturday. “This year has been really tough for me, obviously recovering from knee surgery. I’m coming back at a tournament [where] I’ve done really well in the past, played some amazing matches. The crowd is always really supportive, and the atmosphere is really good.

“I’m super excited to be here again and to get out there and play the sport that I’ve been working so hard to get back to.”