Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Roger Federer defeated Nick Kyrgios 4-6, 7-6(6), 11-9 to clinch the title for Team Europe on the final day of the 2017 Laver Cup held in Prague, Czech Republic.

On the practice court. Day 5 of Roland Garros 2017.

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Ritual: Djokovic's dance after each win in Montreal...

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Milos Raonic defeated Tomas Berdych 6-4, 7-6(7) in the 4th round of the 2016 BNP Paribas Open in Indian Wells, California.

Roger Federer defeated Nick Kyrgios 4-6, 7-6(6), 11-9 to clinch the title for Team Europe on the final day of the 2017 Laver Cup held in Prague, Czech Republic.

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Julien Benneteau with coach Loic Courteau

Andy Murray

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Tomas Berdych at the Australian Open 2016

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Llodra's son Theo

Not sure if it's a smile or a wince...

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Dominic Thiem, Marin Čilić, Alexander Zverev, Roger Federer, and Rafael Nadal attend an event to launch the inaugural Laver Cup on September 20, 2017 in Prague, Czech Republic.

Tomas Berdych

Tomas Berdych

Marinko Matosevic defeating Benoit Paire, Rafa's opponent in the quarters...

Gilles Simon

Czech Tomas Berdych at 2015 French Open.

Roger Federer defeated Nick Kyrgios 4-6, 7-6(6), 11-9 to clinch the title for Team Europe on the final day of the 2017 Laver Cup held in Prague, Czech Republic.

Stan Wawrinka practicing with Tomas Berdych at the 2014 US Open

Day two of the 2009 Davis Cup final: Spain vs. The Czech Republic.

Milos Raonic defeated Tomas Berdych 6-4, 7-6(7) in the 4th round of the 2016 BNP Paribas Open in Indian Wells, California.

Tomas Berdych at the Australian Open 2016

Roger Federer defeated Nick Kyrgios 4-6, 7-6(6), 11-9 to clinch the title for Team Europe on the final day of the 2017 Laver Cup held in Prague, Czech Republic.