"It is true that I have said to the supervisor that I felt the need to hit the umpire because of what he has done to me," Damir Dzumhur told Tennis Majors after being defaulted against Botic van de Zandschulp in Acapulco qualifying.

The 17-time Grand Slam champion, who won the Western & Southern Open in Flushing Meadows on Saturday, won his US Open first-rounder on Monday night over Damir Dzumhur.

Fans packed the stands for the launch of the new exhibition series, as the ATP's world No. 1 headlined the opening day in his home country.

The 17-time major champion announced he will headline an eight-man event running from June 13 through July 5 across Serbia, Croatia, Montenegro and Bosnia.

The Frenchman's been on fire at the ATP 500-level tournament.