Obviously, former Australian Open winner Stan Wawrinka wasn't expecting Slovakian Martin Klizan to put up such a fight.
The world number 35 pushed fourth-seed Wawrinka to a marathon five sets over more than three hours on the first night of play at the Open.
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Stan Wawrinka hits Martin Klizan below the belt
Slovakian tennis star Martin Klizan doubles over in pain after a strong hit from the former Australian Open winner Stan Wawrinka, flies straight into his nether-region.
A rusty Wawrinka – hindered by hitting 43 unforced errors – eventually won, dispatching his adversary 4-6 6-4 7-5 4-6 6-4.
But not before he poured out his frustrations right into his opponent's nether-region.
At 4-4 in the fifth set, Klizan reached for a low return and bunted it harmlessly up in the air – target practice for Wawrinka's meaty forehand.
The Slovakian dropped his racquet-hand, knowing the point was lost. Wawrinka sauntered in, sized up his shot, then slammed the ball as hard as he could into Klizan's groin.
#Wawrinka #Klizan #AusOpen pic.twitter.com/CrahzeeEYx
— doublefault28 (@doublefault28) January 16, 2017
Once again. New balls please... #Klizan vs #Wawrinka in #AusOpen 1R. #ouch https://t.co/AYzeOB8vC9
— Radek Rogowski (@RadekATP) January 16, 2017
Wawrinka, let's remember, has a forehand that has averaged 128km/h before. That's fast.
Klizan sunk to the ground in pain, and Wawrinka quickly clambered over the net to apologise – before going on to win the match.