New York - Fiery Australian star Bernard Tomic was at the centre of a foul-mouthed US Open controversy on Tuesday when he became embroiled in a lewd exchange with a heckler.
The 23-year-old slumped to a 6-4, 6-3, 4-6, 7-6 (7/0) loss to Damir Dzumhur of Bosnia on the old Grandstand court.
But before he lost the first round match, he also spectacularly misplaced his composure, angrily hitting back at a spectator he accused of deliberately trying to get under his skin.
Courtside microphones picked up Tomic telling the fan: "I will put my balls in your mouth" followed moments later by "I will give you some money to make you feel good".
Tomic apologised for the incident, suggesting his Croatian roots may have been a factor in the clash against his Bosnian opponent.
"I apologised for what I said. I think when the guy left after the first set, the crowd got happy because he was a bit annoying," said Tomic who was unable to recall what was said to him.
"He was just sort of saying negative stuff. I didn't know who it was because I was just focusing on the court.
"It was tough to figure out in the background. It's passed and I don't really care who this guy is. He definitely baited me.
"I had problems on the other end, as well, with a few people in the corner. They were saying some negative stuff to me, in my language of Serbian-Croatian. The microphones didn't pick that up. But I obviously caught the blame for that."
Tuesday's controversy was the latest to hit Tomic.
At Wimbledon, he was forced to apologise for using the word "retard" in a press conference.
That outburst came after he had been widely condemned for his boorish behaviour in Madrid when he turned his racquet the wrong way to face a match point against Fabio Fognini.
Tomic later told reporters: "I don't care about that match point. Would you care if you were 23 and worth over $10 million?"
In July last year, he was arrested in Miami after a wild party in a hotel penthouse suite.
He was then dropped from the Australian Davis Cup team and subsequently opted out of the Rio Olympics.
Tomic, seeded 17 for the tournament, committed 78 unforced errors in his tame defeat to Dzumhur who goes on to face either Illya Marchenko of Ukraine or Croatia's Ivan Dodig.
Dzhumur, who lost to Tomic in New York at the same stage last year, said he didn't hear what was said to the Australian.
"Everyone has their own fans and some can go over the limit," said the Bosnian.
"I have had these kind of problems in the past. But if you listen to the fans too much, it's not good for you."
Results from the second day of the 2016 US Open tennis championships at Flushing Meadows on Tuesday (x denotes seeded player):
Dominic Thiem (AUT x8) bt John Millman (AUS) 6-3, 2-6, 5-7, 6-4, 6-3
Ricardas Berankis (LTU) bt Malek Jaziri (TUN) 3-6, 7-6 (7/3), 6-4, 6-2
Pablo Carreno-Busta (ESP) bt Ilya Ivashka (BLR) 6-0, 7-5, 6-2
Janko Tipsarevic (SRB) bt Sam Querrey (USA x29) 7-6 (7/4), 6-7 (0/7), 6-3, 6-3
Steve Johnson (USA x19) bt Evgeny Donskoy (RUS) 4-6, 1-6, 7-6 (7/2), 6-3, 6-3
Juan Martin Del Potro (ARG) bt Diego Schwartzman (ARG) 6-4, 6-4, 7-6 (7/3)
Fabio Fognini (ITA) bt Teimuraz Gabashvili (RUS) 6-7 (9/11), 3-6, 7-6 (7/5), 7-5, 6-4
David Ferrer (ESP x11) bt Alexandr Dolgopolov (UKR) 6-5 - retired
Nick Kyrgios (AUS x14) bt Aljaz Bedene (GBR) 6-4, 6-4, 6-4
Horacio Zeballos (ARG) bt Florian Mayer (GER) 6-3, 6-4, 7-6 (9/7)
Illya Marchenko (UKR) bt Ivan Dodig (CRO) 6-3, 6-4, 6-7 (4/7), 7-5
Damir Dzumhur (BIH) bt Bernard Tomic (AUS x17) 6-4, 6-3, 4-6, 7-6 (7/0)
Alexander Zverev (GER x27) bt Daniel Brands (GER) 3-6, 6-1, 6-4, 7-6 (7/4)
Daniel Evans (GBR) bt Rajeev Ram (USA) 6-2, 4-6, 7-5, 6-1
Alessandro Giannessi (ITA) bt Denis Kudla (USA) 0-6, 6-4, 6-1, 1-6, 6-0
Stan Wawrinka (SUI x3) bt Fernando Verdasco (ESP) 7-6 (7/4), 6-4, 6-4
Kei Nishikori (JPN x6) bt Benjamin Becker (GER) 6-1, 6-1, 3-6, 6-3
Karen Khachanov (RUS) bt Thomas Fabbiano (ITA) 6-3, 6-3, 4-6, 6-3
Paul-Henri Mathieu (FRA) bt Christian Harrison (USA) 6-0, 6-2, 6-1
Nicolas Mahut (FRA) bt Philipp Kohlschreiber (GER x25) 6-3, 7-5, 1-0 - retired
Ivo Karlovic (CRO x21) bt Lu Yen-Hsun (TPE) 4-6, 7-6 (7/4), 6-7 (4/7), 7-6 (7/5), 7-5
Donald Young (USA) bt Jan-Lennard Struff (GER) 6-3, 7-5, 4-6, 7-5
Viktor Troicki (SRB) bt Radu Albot (MDA) 5-7, 3-6, 6-4, 6-4, 7-6 (7/5)
Jared Donaldson (USA) bt David Goffin (BEL x12) 4-6, 7-5, 6-4, 6-0
Feliciano Lopez (ESP x16) bt Borna Coric (CRO) 3-4 - retired
Joao Sousa (POR) bt Victor Estrella (DOM) 6-0, 6-1, 6-1
Jeremy Chardy (FRA) bt Michael Mmoh (USA) 6-4, 6-4, 6-1
Grigor Dimitrov (BUL x22) bt Inigo Cervantes (ESP) 6-2, 6-4, 7-6 (9/7)
Gilles Simon (FRA x30) bt Radek Stepanek (CZE) 6-3, 6-1, 6-4
Paolo Lorenzi (ITA) bt Carlos Berlocq (ARG) 6-4, 6-2, 6-1
Marcel Granollers (ESP) bt Juan Monaco (ARG) 7-6 (7/5), 7-6 (7/2), 6-4
Andy Murray (GBR x2) bt Lukas Rosol (CZE) 6-3, 6-2, 6-2
Serena Williams (USA x1) bt Ekaterina Makarova (RUS) 6-3, 6-3
Vania King (USA) bt Antonia Lottner (GER) 7-6 (7/2), 6-3
Johanna Larsson (SWE) bt Karin Knapp (ITA) 6-4, 6-2
Denisa Allertov (CZE) bt Ana Ivanovic (SRB x29) 7-6 (7/4), 6-1
Wang Qiang (CHN) bt Darya Kasatkina (RUS x23) 6-4, 2-6, 6-2
Yaroslava Shvedova (KAZ) bt Lara Arruabarrena (ESP) 6-2, 6-3
Zhang Shuai (CHN) bt Ellen Perez (AUS) 6-1, 6-1
Samantha Stosur (AUS x16) bt Camila Giorgi (ITA) 7-5, 6-7 (4/7), 6-1
Carla Suarez (ESP x11) bt Teliana Pereira (BRA) 6-0, 6-0
Jelena Jankovic (SRB) bt Mariana Duque (COL) 6-4, 6-1
Annika Beck (GER) bt Nadia Podoroska (ARG) 7-6 (8/6), 6-3
Elena Vesnina (RUS x19) bt Anett Kontaveit (EST) 7-6 (7/4), 4-6, 6-3
Timea Babos (HUN x31) bt Barbara Haas (AUT) 5-7, 6-3, 7-5
Richel Hogenkamp (NED) bt Heather Watson (GBR) 6-2, 7-5
Lucie Safarova (CZE) bt Daria Gavrilova (AUS) 6-4, 6-4
Simona Halep (ROM x5) bt Kirsten Flipkens (BEL) 6-0, 6-2
Agnieszka Radwanska (POL x4) bt Jessica Pegula (USA) 6-1, 6-1
Naomi Broady (GBR) bt Laura Robson (GBR) 6-7 (4/7), 6-3, 6-4
Katerina Siniakov (CZE) bt Eugenie Bouchard (CAN) 6-3, 3-6, 6-2
Caroline Garcia (FRA x25) bt Pauline Parmentier (FRA) 4-6, 6-3, 6-4
Ana Konjuh (CRO) bt Kiki Bertens (NED x20) 6-3, 2-6, 6-4
Kurumi Nara (JPN) bt Stefanie Voegele (SUI) 6-0, 7-5
Varvara Lepchenko (USA) bt Peng Shuai (CHN) 4-6, 7-6 (11/9), 6-3
Timea Bacsinszky (SUI x15) bt Vitalia Diatchenko (RUS) 6-1, 6-1
Karolina Pliskova (CZE x10) bt Sofia Kenin (USA) 6-4, 6-3
Montserrat Gonzalez (PAR) bt Danka Kovinic (MNE) 7-5, 6-2
Kristina Mladenovic (FRA) bt Nao Hibino (JPN) 6-4, 7-5
Anastasia Pavlyuchenkova (RUS x17) bt Louisa Chirico (USA) 6-1, 6-4
Laura Siegemund (GER x26) bt Patricia Tig (ROM) 3-6, 6-3, 6-2
Nicole Gibbs (USA) bt Aleksandra Krunic (SRB) 6-1, 6-0
Julia Gerges (GER) bt Yanina Wickmayer (BEL) 6-3, 6-2
Venus Williams (USA x6) bt Kateryna Kozlova (UKR) 6-2, 5-7, 6-4