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Backhand Boys: Roger Federer's 'band' takes social media by storm — WATCH

Backhand Boys: Roger Federer's 'band' takes social media by storm — WATCH

And giving them company on piano was Grammy Award-winning music producer David Foster, who happens to be Hass' father-in-law.

Grigor Dimitrov confirms participation at star-studded Queen's Club

Grigor Dimitrov confirms participation at star-studded Queen's Club

The 25-year-old, who won at Queen`s in 2014, sees himself as a better player now than he was three years ago.

Top seed Kei Nishikori storms into Buenos Aires final after hard-fought win over Carlos Berlocq

Top seed Kei Nishikori storms into Buenos Aires final after hard-fought win over Carlos Berlocq

The 27-year-old will be chasing his 12th career title on Sunday and third on clay after triumphs in Barcelona in 2014 and 2015.

Rotterdam Open: Jo-Wilfried Tsonga beat Tomas Berdych in straight sets; faces David Goffin in final

Rotterdam Open: Jo-Wilfried Tsonga beat Tomas Berdych in straight sets; faces David Goffin in final

The French sixth seed will compete for his first title at the Ahoy stadium after finishing runner-up six years ago.

Sofia Open: Grigor Dimitrov downs David Goffin in straight sets, wins title for first time

Sofia Open: Grigor Dimitrov downs David Goffin in straight sets, wins title for first time

Former world number eight Dimitrov had seen his ranking plummet to 40 last July but has now climb back up to 13th.

Australian Open 2017: Rafael Nadal beats Grigor Dimitrov in marathon five-setter; to meet Roger Federer in final

Australian Open 2017: Rafael Nadal beats Grigor Dimitrov in marathon five-setter; to meet Roger Federer in final

The Spaniard will now meet old nemesis Roger Federer in a much-awaited clash in the final.

Nadal vs Dimitrov: 10 things you must know about the Australian Open men's semi-final

Nadal vs Dimitrov: 10 things you must know about the Australian Open men's semi-final

Rafael Nadal vs Grigor Dimitrov - winner of the second Australian Open men's semi-final will take on 17-time Grand Slam champion Roger Federer in final on Sunday.

Australian Open: Rafael Nadal needs to beat Grigor Dimitrov to set up high-voltage final against old nemesis Roger Federer

Australian Open: Rafael Nadal needs to beat Grigor Dimitrov to set up high-voltage final against old nemesis Roger Federer

Nadal, 30, has looked fit and aggressive, in beating third seed Milos Raonic, Gael Monfils and Alexander Zverev.

Australian Open 2017: Rafael Nadal vs Grigor Dimitrov - PREVIEW

Australian Open 2017: Rafael Nadal vs Grigor Dimitrov - PREVIEW

The 2009 winner is 7-1 in his matches with Dimitrov, including a four-set quarter-final win at the Australian Open three years ago.

Australian Open: Grigor Dimitrov downs David Goffin in straight sets to reach second Grand Slam semi-final

Australian Open: Grigor Dimitrov downs David Goffin in straight sets to reach second Grand Slam semi-final

It was Dimitrov`s second career Grand Slam semi-final after his last-four appearance at Wimbledon three years ago.

Brisbane International: 'Baby Fed' Grigor Dimitrov beats Kei Nishikori to win first title since 2014

Brisbane International: 'Baby Fed' Grigor Dimitrov beats Kei Nishikori to win first title since 2014

He defeated Japan's Kei Nishikori in three sets, 6-2, 2-6, 6-3 in one hour and 50 minutes at Queensland Tennis Centre.

Paris Masters: Novak Djokovic survives Grigor Dimitrov scare

Paris Masters: Novak Djokovic survives Grigor Dimitrov scare

The record four-time champion will remain top of the rankings if he reaches the final in the French capital.

Andy Murray downs Grigor Dimitrov to win China Open

Andy Murray downs Grigor Dimitrov to win China Open

The victory moves Murray 1,000 points closer to long-reigning world number one Djokovic, with the chance of taking the top spot by year-end.

China Open: Andy Murray sets up final date with Grigor Dimitrov in Beijing

China Open: Andy Murray sets up final date with Grigor Dimitrov in Beijing

Murray, through to the China Open final for the first time, has enjoyed one of the best years of his career, winning Wimbledon and the Olympic gold medal.

Rafael Nadal crashes out of China Open; ATP Finals spot in doubt

Rafael Nadal crashes out of China Open; ATP Finals spot in doubt

Meanwhile, world number 2 Andy Murray defeated his Great Britain Davis Cup team-mate Kyle Edmund to make semis.

Rafael Nadal plays Grigor Dimitrov in China Open quarters

Rafael Nadal plays Grigor Dimitrov in China Open quarters

The 14-time Grand Slam champion is looking for his third ATP World Tour title of the season.

US Open, men's quarter-finals: Andy Murray to take on Kei Nishikori, Juan Martin del Potro up against Stanislas Wawrinka

US Open, men's quarter-finals: Andy Murray to take on Kei Nishikori, Juan Martin del Potro up against Stanislas Wawrinka

Dimitrov committed 43 unforced errors as Murray set up a last-eight clash with Japanese sixth seed Kei Nishikori, the 2014 runner-up who downed 37-year-old Ivo Karlovic 6-3, 6-4, 7-6 (7/4).

US Open 2016: Serena Williams speeds through as Stanislas Wawrinka, Andy Murray battle into last 16

US Open 2016: Serena Williams speeds through as Stanislas Wawrinka, Andy Murray battle into last 16

While Serena Williams encountered little resistance, it was another story for the top men`s seeds in action.

Olympic champion Andy Murray sets up Cincinnati showdown against Marin Cilic

Olympic champion Andy Murray sets up Cincinnati showdown against Marin Cilic

The world number two swept aside his Canadian opponent Raonic 6-3, 6-3 in a thrilling semi-final contest that lasted one and a half hour.

Serena Williams, Andy Murray sent packing in Miami Open shockers

Serena Williams, Andy Murray sent packing in Miami Open shockers

Russian 15th seed Svetlana Kuznetsova stunned 21-time Grand Slam champion Williams 6-7 (3/7), 6-1, 6-2 while British world number two Murray dropped a third-round match to Bulgarian 26th seed Grigor Dimitrov 6-7 (1/7), 6-4, 6-3.