Despite the controversy, the 24-year-old went on to prevail 6-2 7-5 over Nishioka and set up a quarter-final clash with little-known Norbert Gombos of Slovakia. The Australian was broken on service just once while he won 85 percent of his first serves to cement his spot in the quarter-finals.
Ace tennis player Stefanos Tsitsipas has put up a great show against Jordan Thompson of Australia in order to pave his way at Citi Open 2019.
Kyrgios broke Nishioka to lead 4-3 in the second but then threw his drink bottle into the chair umpire's stand after slumping to 4-5 and risked dropping the set, claiming it "slipped".
"I feel like myself, I'm under the spotlight a lot more than most tennis players, "Kyrgios told the Washington City Paper". "I played very courageous and very smart, and suddenly I start thinking about it a bit too much, and that's what happens".
Tsitsipas will now lock horns with France's Benoit Paire, who lost only three first-serve points to outclass fifth-seeded John Isner of America 7-6 (3), 6-3.
Gojowczyk, who only made the event after Australian Bernard Tomic dropped out with a finger injury, added the world number 34 to a U.S. capital victims list that includes Canada's 20th-ranked Milos Raonic and 25th-ranked Aussie Alex De Minaur.
Russian third seed Daniil Medvedev advanced to the semi-finals by defeating Croatian sixth seed and 2014 US Open champion Marin Cilic 6-4, 7-6 (9/7). "It's very pleasing knowing that I can be mature and handle those situations very bravely, so I'm really happy with that", said Tsitsipas. "I still think I can improve many things and that's why every day I come to the court".
In Men's Doubles renowned brothers Andy Murray and Jamie Murray reached the quarterfinal round as they toppled over powerful opponents Nicolas Mahut and Edouard Roger-Vasselin with a scoreline of 6-4, 6-7 (7), 10-5. "I haven't gone to bed - the past few nights I got to bed at like 1 a.m. because of doubles", McNally said.
Jeremy Chardy beat second seed Dusan Lajovic in the round of 16, but the Frenchman could not follow that win up against Albert Ramos-Vinolas, who triumphed 6-3 6-4 to set up a semi against Ruud.