ATP Tour

Watch highlights as Nick Kyrgios defeats Stefanos Tsitsipas in three tie-break sets at the ATP Cup. Watch live tennis streams at http://www.tennistv.com. Photo credit: Bradley Kanaris/Getty Images.

Stan Wawrinka and Jo-Wilfried Tsonga kicked off the Qatar ExxonMobil Open by hitting outside of the National Museum Of Qatar.

Simone Bolelli and Fabio Fognini get the better of Austin Krajicek and Rajeev Ram in an extended rally at the ATP Cup. Watch live tennis streams at http://www.tennistv.com. Photo credit: Daniel Carson/ATP Tour.

Handed the task of introducing their teammates, players competing at the ATP Cup had plenty of jokes to share.

Watch Hot Shot as Nick Kyrgios rips a backhand return winner to defeat Stefanos Tsitsipas in a final-set tie-break at the ATP Cup. Watch live tennis streams at http://www.tennistv.com. Photo credit: Regina Cortina/ATP Tour.

Watch Hot Shot as Stefanos Tsitsipas overcomes a great defensive effort from Nick Kyrgios at the ATP Cup. Watch live tennis streams at http://www.tennistv.com. Photo: Bradley Kanaris/Getty Images.

David Goffin describes his emotions after beating Grigor Dimitrov to take Belgium's tie against Bulgaria to a decisive doubles match. Watch live tennis streams at http://www.tennistv.com.

Watch Hot Shot as Nick Kyrgios is rewarded for attacking play against Stefanos Tsitsipas at the ATP Cup. Watch live tennis streams at http://www.tennistv.com. Photo: Jono Searle/Getty Images.

Watch Hot Shot as David Goffin draws applause from Grigor Dimitrov after chasing down a drop shot and landing a forehand winner at the ATP Cup. Watch live tennis streams at http://www.tennistv.com. Photo: Peter Staples/ATP Tour.

Watch Hot Shot as Michail Pervolarakis takes his chance to step in and rip a forehand winner against John Millman at the ATP Cup. Watch live tennis streams at http://www.tennistv.com. Photo: Regina Cortina/ATP Tour.

Watch Hot Shot as Grigor Dimitrov takes the opening set against David Goffin with a backhand passing shot. Watch live tennis streams at http://www.tennistv.com. Photo: Peter Staples/ATP Tour.

Watch Hot Shot as Grigor Dimitrov delivers his best tennis against David Goffin at the ATP Cup: Watch live tennis streams at http://www.tennistv.com. Photo: Regina Cortina/ATP Tour

Watch Hot Shot as Casper Ruud hits the shot of the day in doubles action at the ATP Cup. Watch live tennis streams at http://www.tennistv.com. Photo: David Gray/ATP Tour

Watch Hot Shot as Dimitar Kuzmanov constructs a perfect point against Steve Darcis at the ATP Cup. Watch live tennis streams at http://www.tennistv.com. Photo: Matt King/Getty Images

Dimitar Kuzmanov talks about why he's thriving as part of Team Bulgaria at the ATP Cup. Watch live tennis streams at http://www.tennistv.com.

Team Russia has advanced out of round-robin action in Perth and qualified for the Final Eight in Sydney. Watch live tennis streams at http://www.tennistv.com.

Watch Hot Shot as German Andreas Mies hits a winning volley off Canadian Denis Shapovalov's smash in doubles at the ATP Cup. Watch live tennis streams at http://www.tennistv.com.

Radu Albot wanted a better understanding of the Video Review during his ATP Cup doubles match and got up close with the chair umpire. Watch live tennis streams at http://www.tennistv.com.

Watch Hot Shot as Denis Shapovalov shows off his wheels to carve out a winner against Alexander Zverev at the ATP Cup. Watch live tennis streams at http://www.tennistv.com. Photo: Bradley Kanaris/Getty Images

Watch as Dan Evans withstands a barrage of baseline blasts from Moldovan Radu Albot at the ATP Cup. Watch live tennis streams at http://www.tennistv.com. Photo: Peter Staples/ATP Tour

Jan-Lennard Struff pledges a personal donation to help fight the bushfires in Australia after his win over Felix Auger-Aliassime at the ATP Cup. Watch live tennis streams at http://www.tennistv.com.

The members of Team Belgium take in one of Sydney's most iconic sites during the ATP Cup. Watch live tennis streams at http://www.tennistv.com.

The members of Team Croatia sign autographs and pose for pictures with their fans in Sydney at the ATP Cup.

Watch highlights as Team Serbia, Spain and Austria all win their ties on Day 4 of the ATP Cup in Brisbane, Sydney and Perth. Watch live tennis streams at http://www.tennistv.com. Photo: Chris Hyde/Getty Images

Watch as Novak Djokovic loses a point for encroachment at the ATP Cup after France's successful Video Review challenge. Watch live tennis streams at http://www.tennistv.com. Photo: AFP/Getty Images.