Berdych showed the ultimate sportsmanship on Friday by paying homage to Djokovic, who had to retire from his quarterfinals match this week.
Nearly half of the tennis pros competing in the quarterfinals are wearing this one brand.
Today is the tennis star’s 30th birthday.
The Serbian player, who celebrates his 30th birthday today, is ranked No. 2 in men’s singles tennis.
Djokovic, who has won six Australian Open titles, was stunned by Istomin, a wild card in the tournament.
He has three tournaments left to upend Novak Djokovic’s world No. 1 ranking.
The world No. 1 tennis star overpowered the No. 84-ranked player.
The sportswear brand praised the athlete on Twitter after the stunning victory.