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New York - Ivo Karlovic served his way into the US Open record books on Tuesday when he fired 61 aces in his 4-6, 7-6 (7/4), 6-7 (4/7), 7-6 (7/5), 7-5 win over Lu Yen-Hsun of Taiwan.
Karlovic, 37, beat the previous best of 49 aces for one match in New York served up by Richard Krajicek in his quarter-final loss to Yevgeny Kafelnikov in 1999.
"I knew there were a lot of aces because there was a period (in the second set) when almost every serve was an ace. I knew there was a lot but I didn't know it was this many," said 6ft 11in (2.11m) Karlovic.
Karlovic had three times previously served more than 50 aces in a tournament - his previous best in a tour match was 55 against Lleyton Hewitt in 2009 at the French Open.
In the same year, he served 78 aces against the Czech Republic's Radek Stepanek in a Davis Cup clash.
He has now served 11,277 aces in his career, 1000 more than second-placed Goran Ivanisevic.
"Of course this is my best shot. I have worked a lot on it. I'm proud of it," said Karlovic.
America's John Isner holds the all-time Grand Slam record of 113 aces served during his famous 70-68 fifth-set victory over Nicolas Mahut in the first round of Wimbledon in 2010.
Karlovic's achievement on Tuesday sparked an immediate Twitter reaction.
"@ivokarlovic dude 61 WTF," tweeted Australian star Nick Kyrgios.
Karlovic replied, tongue in cheek: "Yeah got some shoulder issues!"
Yeah got some shoulder issues ?? https://t.co/NGL0dYs5F8
— ivo karlovic (@ivokarlovic) August 31, 2016
Results from the second day of the 2016 US Open tennis championships at Flushing Meadows on Tuesday (x denotes seeded player):
Men
1st rd
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 Carreo-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 Martn 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 Aleksandr 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
Joo Sousa (POR) bt Vctor Estrella (DOM) 6-0, 6-1, 6-1
Jrmy 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
Women
1st rd
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 Surez (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
Tmea 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 Eugnie 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 Vgele (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
Karolna Plskov (CZE x10) bt Sofia Kenin (USA) 6-4, 6-3
Montserrat Gonzlez (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
