File photo of America's John Isner.
John Isner, the United States number one tennis player, was sent crashing out of the first round of the Australian Open by compatriot Reilly Opelka 7-6(4) 7-6(6) 6-7(4) 7-6(5), on Monday.
Ishner, who is Wimbledon semi-finalist, fell at the first hurdle at Melbourne Park for the second year in a row. Last year, he was beaten by unseeded Australian Matthew Ebden.
The 21-year-old Opelka broke the ninth seed's perfect 9-0 winning record against Americans at the Grand Slams in a match featuring 87 aces.
"You keep working and put your head down and kind of disappear once I leave here and just work." And, you know, trust that that's going to pay dividends for me in the future," Isner said.
Opelka will next play 102nd ranked Italy's Thomas Fabbiano in the second round.
Isner, who is Wimbledon semi-finalist, fell at the first hurdle at Melbourne Park for the second year in a row.