Team Norway's Casper Ruud beats World No. 12 Fabio Fognini on Sunday at the ATP Cup in Perth.

Viktor Durasovic and Casper Ruud beat Austin Krajicek and Rajeev Ram to earn Team Norway a 2-1 victory against Team United States at the ATP Cup.

Casper Ruud beats John Isner of Team United States, then competes with Viktor Durasovic for a memorable doubles win on Friday at the ATP Cup.

Casper Ruud records the biggest win of his career over John Isner of Team United States on Friday at the ATP Cup in Perth.

Casper Ruud is ready to show off the improvements in his game at the ATP Cup in Perth.

Casper Ruud trained with Rafael Nadal at the Rafa Nadal Academy by Movistar during the off-season.

Norway's Casper Ruud will look to advance to the Next Gen ATP Finals semi-finals on Thursday.

Casper Ruud moves to 1-1 in Group A on Day 2 at the Next Gen ATP Finals.

Casper Ruud is ready to kick off the 2019 Next Gen ATP Finals against Miomir Kecmanovic.

The third edition of the Next Gen ATP Finals will take place from 5-9 November at Allianz Cloud, Milan.

(L to R): Mikael Ymer, Jannik Sinner, Alejandro Davidovich Fokina, Frances Tiafoe, Ugo Humbert, Miomir Kecmanovic and Casper Ruud attend the launch for the 2019 Next Gen ATP Finals.

(L to R): Casper Ruud, Mikael Ymer, Miomir Kecmanovic, Jannik Sinner, Frances Tiafoe, Ugo Humbert and Alejandro Davidovich Fokina enjoyed this year's launch party at the Lavazza Flagship Store.

(L to R): Mikael Ymer, Jannik Sinner, Alejandro Davidovich Fokina, Frances Tiafoe, Ugo Humbert, Miomir Kecmanovic and Casper Ruud attend the draw party for the 2019 Next Gen ATP Finals.

Casper Ruud, Taylor Fritz and Denis Shapovalov play tennis with children ahead of the Intrum Stockholm Open.

Casper Ruud is making his main draw debut at the Intrum Stockholm Open this year.

Eighth seed Casper Ruud beats Salvatore Caruso 6-3, 6-4 in 74 minutes on Thursday in St. Petersburg.

Casper Ruud breaks Ernests Gulbis' serve six times to oust the Latvian in straight sets and reach the second round at Roland Garros.

Casper Ruud earns his first ATP Masters 1000 win on Monday in Rome.

Christian Ruud, left, helped his son, Casper Ruud, crack the Top 100 of the ATP Rankings this year.

Casper Ruud marches into his first ATP Tour final in Houston.

Casper Ruud beats Hugo Dellien on Friday in Sao Paulo to reach his second ATP Tour semi-final.

#NextGenATP Norwegian Casper Ruud scores one of his biggest wins against Joao Sousa at the Rio Open presented by Claro.

Casper Ruud qualifies for the US Open, his third successful Grand Slam qualifying bid of 2018.

Casper Ruud records the biggest match win of his career on Thursday with victory over three-time champion David Ferrer in Bastad.

Casper Ruud saves six of seven break points against him to oust fellow #NextGenATP player Jaume Munar in Bastad on Monday.