The tallest ATP players stand 6 feet 11 inches (2.11 metres): Ivo Karlovic and Reilly Opelka. They share the height mark among the best-known players on the men’s tour, with John Isner close behind at 6 feet 10 inches (2.08 metres).
Height can make a tennis player’s serve a major weapon, but it does not guarantee success. Karlovic and Opelka show how a towering frame can shape a player’s tactics—and why movement, timing and a strong return still matter.
Who is the tallest ATP player?
There is a tie at the top. Croatian Ivo Karlovic and American Reilly Opelka are both listed at 6 feet 11 inches. That makes them the tallest players in the group of notable ATP Tour competitors most often cited for this record.
| Player | Listed height | Known for |
|---|---|---|
| Ivo Karlovic | 6’11” (2.11 m) | Huge serve and long professional career |
| Reilly Opelka | 6’11” (2.11 m) | Powerful serve and aggressive first-strike tennis |
| John Isner | 6’10” (2.08 m) | Serve-led game and a famous marathon match |
Player heights are commonly reported in feet and inches, then converted to centimetres. Small differences in published metric figures can come from rounding; 6’11” converts to about 210.8 centimetres, usually rounded to 211 centimetres.
Ivo Karlovic: the serve-first pioneer
Karlovic turned height into one of the most recognizable serves in tennis. His contact point was exceptionally high, giving him the ability to hit down into the service box while still generating pace. His delivery also made it difficult for opponents to read whether the ball would go wide, into the body or down the middle.
His game was built around making the first two shots count. A powerful serve could earn an ace or a weak return; Karlovic could then finish with a volley or a firm groundstroke. That approach was especially effective on fast courts, where the ball skids through and the returner has less time to react.
He reached a career-high ranking of No. 14 and won 13 ATP singles titles. Those results matter because they show that a massive serve can support a long, successful career—not merely produce highlight-reel aces. At the same time, Karlovic’s style was a reminder that serving well does not remove every challenge. He still had to build points, defend and find ways to pressure opponents when the first serve did not land.
Reilly Opelka: height with modern power
Opelka is also listed at 6’11”, and his serve is the foundation of his game. Like Karlovic, he can use the height of his contact point to create steep angles and make the ball bounce awkwardly. His serve can set up a short return, letting him attack with his forehand or move forward.
Opelka has won four ATP singles titles and reached a career-high ranking of No. 17. His best results show the value of pairing a huge serve with aggressive groundstrokes. He is not simply waiting for an ace: when he gets a manageable ball, he looks to take control early.
For a player of Opelka’s size, the key is often to make the first strike decisive. Long rallies can demand repeated changes of direction and low, quick footwork. A short point, by contrast, lets him use his serve and power before an opponent can test his movement over and over.
How does height help—and where can it be a challenge?
A tall player’s biggest advantage is usually the serve. A higher contact point gives the server more options to hit down into the box, and it can create sharp angles that pull a returner well outside the court. The extra reach can also help with volleys and high balls.
There are trade-offs. Tall players may have to work harder to get down to low shots, recover after being pulled wide and change direction quickly. Those demands do not affect every player in the same way, and height alone cannot explain a player’s movement or fitness. But opponents often try to make a big server hit from uncomfortable positions rather than allow a steady rhythm of serve-and-forehand attacks.
- On fast courts: a strong serve is more likely to earn a weak return or a quick point.
- On slower courts: the returner may have more time to get the ball back, so the server needs to win points from the baseline too.
- Against a big server: standing position, return timing and a willingness to attack second serves can all matter.
That is why height is an advantage, not a complete game plan. The best tall players turn their serve into pressure, then use smart positioning and confident groundstrokes to finish the point.
How close is John Isner?
At 6’10”, John Isner is only an inch shorter than Karlovic and Opelka. He built a remarkable career around his serve, reached a career-high ranking of No. 8 and won 16 ATP singles titles. Isner is also remembered for his 2010 Wimbledon match against Nicolas Mahut, the longest match in professional tennis history by duration and games.
Isner’s career is a useful comparison: even among exceptionally tall players, an inch does not define the outcome. Serve quality, court positioning, shot selection and mental toughness all help determine how far a player goes.
Frequently Asked Questions
Who is the tallest ATP player ever?
Ivo Karlovic and Reilly Opelka are both listed at 6’11” (about 2.11 metres), making them the tallest well-known ATP Tour players by listed height.
Is Reilly Opelka taller than John Isner?
Yes. Opelka is listed at 6’11”, while Isner is listed at 6’10”. The difference is one inch, or about 2.5 centimetres.
Does being tall guarantee a powerful serve?
No. Height can provide a high contact point and useful serving angles, but pace, accuracy, disguise and consistency depend on technique and practice.
Are tall players always slower around the court?
No. Players vary in speed and movement, regardless of height. A tall frame can make low balls and quick changes of direction demanding, but athleticism and footwork make a major difference.
Final Thoughts
The tallest ATP players are Ivo Karlovic and Reilly Opelka, both listed at 6 feet 11 inches. Their careers show how a high contact point and a powerful serve can shape a winning style. John Isner, just an inch shorter, offers another example of how far that approach can go. Still, height is only one part of the story: the players who turn it into results must also return, move well enough to defend and make their groundstrokes count.
