As a professional, he has won ten titles and advanced to the semifinals of the 2017 Wimbledon Championships. Now that he's 33, it's looking increasingly unlikely that he'll ever win a Grand Slam title.
If things start to go his way, he may be considered the best player in the world. He is one of the more complete players the game has seen at this height, standing at 6'6".
Cilic's serve may not be as strong as that of other taller players, but when he hits his areas, it can be a huge weapon. He has never had a tremendously interesting game for spectators to follow at 6'6" tall.
In 2018, he rose to number three in the world after a strong recovery from injury. He has a far more well-rounded game than the majority of the other tall players.
He has five double titles under his belt, and his stature allows him to dominate when covering half of the court. In addition, he is the only left-handed player on the list.
That began to improve once he turned 30, when he reached the finals of the US Open in 2017 and the Wimbledon final in 2018. The South African attended Illinois University and played football there.
He reached the Wimbledon semifinals, putting him in the top 20 in the world. Since then, the Polish tennis player has had a difficult time.
With a serve speed of 157.2 mph in 2016, Isner holds the record for the official fastest serve in ATP history. Now that he is over the age of 30, he has played his best tennis in the last several years.
His first serve regularly exceeds 140 mph, putting him near the top of serving lists year after year. As a player now ranked inside the top 40, he is demonstrating consistency.
The Croatian has been on tour for a long time, and while he has never had a truly outstanding run at a major, he has won eight times in his career.