A day after turning 30, Sam Groth announced he would be hanging up his racket at his home Slam, the Australian Open.

Groth reached a career-high ranking of No. 53 in 2015 before numerous injuries would slow, and ultimately end, his career. Despite a string of bad luck, Groth has come to be well-known on both the singles and doubles tours.

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The world No. 223 won two career doubles ATP titles (Newport in 2016 and Bogota in 2014) and reached three more doubles finals (all in 2014). His career-best Grand Slam singles runs came at the Australian Open (third round, '15) and Wimbledon (third round, '14).

Here’s a look back at his career and five things you may not know about Groth.

1

He has the fastest serve, ever.

No joke. Groth owns the distinction of hitting the fastest serve on record, raining down a 163.4 mph. Granted, it was an ATP Challenger match in 2012, but still, few players could dream of hitting a serve that hard.

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2

He made the French Open semifinals as an unseeded doubles player.

In 2014, Groth and his doubles partner Andrey Golubev made a deep run at the French Open, getting as far as the semifinals, before losing to eventual champions Julien Benneteau and Eduoard Roger-Vasselin. It's Groth's best run at a major (followed by the doubles quarterfinals of the Australian Open this year).

3

He gave Roger Federer a scare at Wimbledon.

In 2015, Federer looked to be en route to another Wimbledon final appearance without dropping a set—until he ran into Groth in the third round. After two competitive sets that Federer won 6-4, 6-4, no one would have blamed Groth for fading. Instead, in a career-defining moment, Groth battled his way to a tiebreak win. Federer cruised 6-2 in the fourth set. Groth also hit the second fastest serve in Wimbledon history (147 mph) in the battle.

4

He is an avid blogger.

In partnership with the Tennis Channel, both Groth and Nicole Gibbs publish a regular journal called “My Tennis Life.” Groth gives fans an unvarnished look at everyday life on tour for players in a less glamorous position than the top players. Maybe most important of all, he posts plenty of pics of his adorable new puppy.

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Fittingly, Groth announced his retirement with a video for My Tennis Life.

5

He may have a future in broadcast.

As Groth considers what’s next in his life, at least one notable name in tennis media has suggested a career in the broadcast booth might not be too far behind.

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Whatever comes next for Groth, he can leave the sport knowing he made the most of his opportunities—both on and off the court.