Player challenge protocol for electronic line calling at the US Open includes three challenges per set plus one for tiebreakers.

In 2006, the US Open became the first Grand Slam to use electronic line calling technology, creating a "2 plus 1" player challenge system. The technology was introduced to improve officiating for players, while increasing the intrigue and excitement for in-stadium fans and television viewers. The new technology was immediately embraced by officials, players and fans.

In 2010, the "3 plus 1" player challenge system was introduced. All professional tennis events where an electronic line calling system is in place, including all Olympus US Open Series events this summer, use the "3 plus 1" protocol.

The on-court player challenge system for review of line calls at the US Open is as follows:

• Each player is allowed a maximum of three incorrect challenges per set after which they are not permitted to challenge again in that set.
• If a set goes to a tiebreaker, each player will receive one additional challenge.
• Challenges may not be carried over from one set to another.

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Select a match to view the challenge point summary for that match.

Day 9
> Mixed Doubles Third Round :: Andrea Hlavackova/Lukasz Kubot vs. Anastasia Rodionova/Max Mirnyi
> Mixed Doubles Third Round :: Bethanie Mattek-Sands/Sam Querrey vs. Yaroslava Shvedova/Juan Sebastian Cabal
> Men's Doubles Fourth Round :: Marcin Matkowski/Nenad Zimonjic vs. Jamie Murray/John Peers
> Men's Doubles Fourth Round :: Pierre-Hugues Herbert/Nicolas Mahut vs. Jean-Julien Rojer/Horia Tecau
> Women's Doubles Fourth Round :: Martina Hingis/Sania Mirza vs. Yung-Jan Chan/Hao-Ching Chan
> Women's Doubles Fourth Round :: Lara Arruabarrena/Andreja Klepac vs. Sara Errani/Flavia Pennetta
> Men's Singles Fourth Round :: Novak Djokovic vs. Feliciano Lopez
> Men's Singles Fourth Round :: Jo-Wilfried Tsonga vs. Marin Cilic
> Women's Singles Fourth Round :: Serena Williams vs. Venus Williams
> Women's Singles Fourth Round :: Kristina Mladenovic vs. Roberta Vinci
Day 8
> Men's Doubles Third Round :: Steve Johnson/Sam Querrey vs. Michael Russell/Donald Young
> Men's Doubles Third Round :: Marcin Matkowski/Nenad Zimonjic vs. Raven Klaasen/Rajeev Ram
> Men's Doubles Third Round :: Eric Butorac/Scott Lipsky vs. Jean-Julien Rojer/Horia Tecau
> Men's Doubles Third Round :: Rohan Bopanna/Florin Mergea vs. Daniel Nestor/Edouard Roger-Vasselin
> Women's Doubles Third Round :: Timea Babos/Kristina Mladenovic vs. Lara Arruabarrena/Andreja Klepac
> Women's Doubles Third Round :: Karin Knapp/Roberta Vinci vs. Alla Kudryavtseva/Anastasia Pavlyuchenkova
> Mixed Doubles Third Round :: Su-Wei Hsieh/Henri Kontinen vs. Yung-Jan Chan/Rohan Bopanna
> Men's Singles Fourth Round :: Stan Wawrinka vs. Donald Young
> Men's Singles Fourth Round :: Kevin Anderson vs. Andy Murray
> Men's Singles Fourth Round :: Tomas Berdych vs. Richard Gasquet
> Men's Singles Fourth Round :: John Isner vs. Roger Federer
> Women's Singles Fourth Round :: Petra Kvitova vs. Johanna Konta
> Women's Singles Fourth Round :: Samantha Stosur vs. Flavia Pennetta
> Women's Singles Fourth Round :: Varvara Lepchenko vs. Victoria Azarenka
> Women's Singles Fourth Round :: Sabine Lisicki vs. Simona Halep
Day 7
> Mixed Doubles Second Round :: Andrea Hlavackova/Lukasz Kubot vs. Taylor Townsend/Donald Young
> Mixed Doubles Second Round :: Anastasia Rodionova/Max Mirnyi vs. Raquel Kops-Jones/Raven Klaasen
> Mixed Doubles Second Round :: Julia Goerges/Nenad Zimonjic vs. Simona Halep/Horia Tecau
> Men's Doubles Third Round :: Leonardo Mayer/Joao Sousa vs. Colin Fleming/Treat Huey
> Men's Doubles Third Round :: Marcel Granollers/Marc Lopez vs. Pierre-Hugues Herbert/Nicolas Mahut
> Men's Doubles Third Round :: Tommy Haas/Radek Stepanek vs. Dominic Inglot/Robert Lindstedt
> Women's Doubles Third Round :: Martina Hingis/Sania Mirza vs. Michaella Krajicek/Barbora Strycova
> Women's Doubles Third Round :: Yung-Jan Chan/Hao-Ching Chan vs. Irina-Camelia Begu/Raluca Olaru
> Women's Doubles Third Round :: Sara Errani/Flavia Pennetta vs. Raquel Kops-Jones/Abigail Spears
> Women's Doubles Third Round :: Jelena Jankovic/Aleksandra Krunic vs. Casey Dellacqua/Yaroslava Shvedova
> Women's Doubles Third Round :: Andrea Hlavackova/Lucie Hradecka vs. Anna-Lena Groenefeld/Coco Vandeweghe
> Women's Doubles Third Round :: Kiki Bertens/Johanna Larsson vs. Caroline Garcia/Katarina Srebotnik
> Men's Singles Fourth Round :: Novak Djokovic vs. Roberto Bautista Agut
> Men's Singles Fourth Round :: Feliciano Lopez vs. Fabio Fognini
> Men's Singles Fourth Round :: Benoit Paire vs. Jo-Wilfried Tsonga
> Men's Singles Fourth Round :: Marin Cilic vs. Jeremy Chardy
> Women's Singles Fourth Round :: Serena Williams vs. Madison Keys
> Women's Singles Fourth Round :: Kristina Mladenovic vs. Ekaterina Makarova
Day 6
> Men's Doubles Second Round :: Eric Butorac/Scott Lipsky vs. Gilles Muller/Aisam-Ul-Haq Qureshi
> Men's Doubles Second Round :: Jeremy Chardy/Lukasz Kubot vs. Daniel Nestor/Edouard Roger-Vasselin
> Women's Doubles Second Round :: Martina Hingis/Sania Mirza vs. Timea Bacsinszky/Chia-Jung Chuang
> Women's Doubles Second Round :: Sara Errani/Flavia Pennetta vs. Asia Muhammad/Maria Sanchez
> Mixed Doubles Second Round :: Bethanie Mattek-Sands/Sam Querrey vs. Daria Gavrilova/John Peers
> Mixed Doubles Second Round :: Sachia Vickery/Frances Tiafoe vs. Su-Wei Hsieh/Henri Kontinen
> Men's Singles Third Round :: Stan Wawrinka vs. Ruben Bemelmans
> Men's Singles Third Round :: Viktor Troicki vs. Donald Young
> Men's Singles Third Round :: Kevin Anderson vs. Dominic Thiem
> Men's Singles Third Round :: Thomaz Bellucci vs. Andy Murray
> Men's Singles Third Round :: Tomas Berdych vs. Guillermo Garcia-Lopez
> Men's Singles Third Round :: Bernard Tomic vs. Richard Gasquet
> Men's Singles Third Round :: John Isner vs. Jiri Vesely
> Men's Singles Third Round :: Philipp Kohlschreiber vs. Roger Federer
> Women's Singles Third Round :: Petra Kvitova vs. Anna Karolina Schmiedlova
> Women's Singles Third Round :: Andrea Petkovic vs. Johanna Konta
> Women's Singles Third Round :: Sara Errani vs. Samantha Stosur
> Women's Singles Third Round :: Flavia Pennetta vs. Petra Cetkovska
> Women's Singles Third Round :: Varvara Lepchenko vs. Mona Barthel
> Women's Singles Third Round :: Victoria Azarenka vs. Angelique Kerber
> Women's Singles Third Round :: Barbora Strycova vs. Sabine Lisicki
> Women's Singles Third Round :: Shelby Rogers vs. Simona Halep
Day 5
> Men's Doubles First Round :: Sam Groth/Lleyton Hewitt vs. Henri Kontinen/Horacio Zeballos
> Mixed Doubles First Round :: Sania Mirza/Bruno Soares vs. Andrea Hlavackova/Lukasz Kubot
> Mixed Doubles First Round :: Eugenie Bouchard/Nick Kyrgios vs. Elina Svitolina/Artem Sitak
> Men's Doubles Second Round :: Steve Johnson/Sam Querrey vs. Leander Paes/Fernando Verdasco
> Men's Doubles Second Round :: Santiago Giraldo/Rameez Junaid vs. Jamie Murray/John Peers
> Women's Doubles Second Round :: Anna-Lena Groenefeld/Coco Vandeweghe vs. Su-Wei Hsieh/Anastasia Rodionova
> Men's Singles Third Round :: Novak Djokovic vs. Andreas Seppi
> Men's Singles Third Round :: Roberto Bautista Agut vs. David Goffin
> Men's Singles Third Round :: Milos Raonic vs. Feliciano Lopez
> Men's Singles Third Round :: Fabio Fognini vs. Rafael Nadal
> Men's Singles Third Round :: Benoit Paire vs. Tommy Robredo
> Men's Singles Third Round :: Jo-Wilfried Tsonga vs. Sergiy Stakhovsky
> Men's Singles Third Round :: Marin Cilic vs. Mikhail Kukushkin
> Men's Singles Third Round :: Jeremy Chardy vs. David Ferrer
> Women's Singles Third Round :: Serena Williams vs. Bethanie Mattek-Sands
> Women's Singles Third Round :: Madison Keys vs. Agnieszka Radwanska
> Women's Singles Third Round :: Belinda Bencic vs. Venus Williams
> Women's Singles Third Round :: Anett Kontaveit vs. Madison Brengle
> Women's Singles Third Round :: Daria Kasatkina vs. Kristina Mladenovic
> Women's Singles Third Round :: Elina Svitolina vs. Ekaterina Makarova
> Women's Singles Third Round :: Roberta Vinci vs. Mariana Duque-Marino
> Women's Singles Third Round :: Eugenie Bouchard vs. Dominika Cibulkova
Day 4
> Men's Singles Second Round :: Stan Wawrinka vs. Hyeon Chung
> Men's Singles Second Round :: Ruben Bemelmans vs. Jack Sock
> Men's Singles Second Round :: Aljaz Bedene vs. Donald Young
> Men's Singles Second Round :: Adrian Mannarino vs. Andy Murray
> Men's Singles Second Round :: Tomas Berdych vs. Jurgen Melzer
> Men's Singles Second Round :: Nicolas Mahut vs. Guillermo Garcia-Lopez
> Men's Singles Second Round :: Bernard Tomic vs. Lleyton Hewitt
> Men's Singles Second Round :: Robin Haase vs. Richard Gasquet
> Men's Singles Second Round :: John Isner vs. Mikhail Youzhny
> Men's Singles Second Round :: Steve Darcis vs. Roger Federer
> Women's Singles Second Round :: Petra Kvitova vs. Nicole Gibbs
> Women's Singles Second Round :: Andrea Petkovic vs. Elena Vesnina
> Women's Singles Second Round :: Johanna Konta vs. Garbine Muguruza
> Women's Singles Second Round :: Sara Errani vs. Jelena Ostapenko
> Women's Singles Second Round :: Evgeniya Rodina vs. Samantha Stosur
> Women's Singles Second Round :: Flavia Pennetta vs. Monica Niculescu
> Women's Singles Second Round :: Petra Cetkovska vs. Caroline Wozniacki
> Women's Singles Second Round :: Victoria Azarenka vs. Yanina Wickmayer
> Women's Singles Second Round :: Karin Knapp vs. Angelique Kerber
> Women's Singles Second Round :: Camila Giorgi vs. Sabine Lisicki
> Women's Singles Second Round :: Kateryna Bondarenko vs. Simona Halep
Day 3
> Men's Doubles First Round :: Bob Bryan/Mike Bryan vs. Steve Johnson/Sam Querrey
> Men's Singles Second Round :: Novak Djokovic vs. Andreas Haider-Maurer
> Men's Singles Second Round :: Milos Raonic vs. Fernando Verdasco
> Men's Singles Second Round :: Mardy Fish vs. Feliciano Lopez
> Men's Singles Second Round :: Fabio Fognini vs. Pablo Cuevas
> Men's Singles Second Round :: Diego Schwartzman vs. Rafael Nadal
> Men's Singles Second Round :: Sam Groth vs. Tommy Robredo
> Men's Singles Second Round :: Jo-Wilfried Tsonga vs. Marcel Granollers
> Men's Singles Second Round :: Marin Cilic vs. Evgeny Donskoy
> Men's Singles Second Round :: Mikhail Kukushkin vs. Grigor Dimitrov
> Men's Singles Second Round :: Filip Krajinovic vs. David Ferrer
> Women's Singles Second Round :: Serena Williams vs. Kiki Bertens
> Women's Singles Second Round :: Bethanie Mattek-Sands vs. Coco Vandeweghe
> Women's Singles Second Round :: Madison Keys vs. Tereza Smitkova
> Women's Singles Second Round :: Magda Linette vs. Agnieszka Radwanska
> Women's Singles Second Round :: Irina Falconi vs. Venus Williams
> Women's Singles Second Round :: Anastasia Pavlyuchenkova vs. Anett Kontaveit
> Women's Singles Second Round :: Madison Brengle vs. Anna Tatishvili
> Women's Singles Second Round :: Lauren Davis vs. Ekaterina Makarova
> Women's Singles Second Round :: Eugenie Bouchard vs. Polona Hercog
> Women's Singles Second Round :: Jessica Pegula vs. Dominika Cibulkova
Day 2
> Men's Singles First Round :: Stan Wawrinka vs. Albert Ramos-Vinolas
> Men's Singles First Round :: Victor Estrella Burgos vs. Jack Sock
> Men's Singles First Round :: Donald Young vs. Gilles Simon
> Men's Singles First Round :: Nick Kyrgios vs. Andy Murray
> Men's Singles First Round :: Tomas Berdych vs. Bjorn Fratangelo
> Men's Singles First Round :: Sam Querrey vs. Nicolas Mahut
> Men's Singles First Round :: Bernard Tomic vs. Damir Dzumhur
> Men's Singles First Round :: Thanasi Kokkinakis vs. Richard Gasquet
> Men's Singles First Round :: John Isner vs. Malek Jaziri
> Men's Singles First Round :: Leonardo Mayer vs. Roger Federer
> Women's Singles First Round :: Andrea Petkovic vs. Caroline Garcia
> Women's Singles First Round :: Carina Witthoeft vs. Garbine Muguruza
> Women's Singles First Round :: Timea Babos vs. Samantha Stosur
> Women's Singles First Round :: Jamie Loeb vs. Caroline Wozniacki
> Women's Singles First Round :: Lucie Safarova vs. Lesia Tsurenko
> Women's Singles First Round :: Varvara Lepchenko vs. Kirsten Flipkens
> Women's Singles First Round :: Victoria Azarenka vs. Lucie Hradecka
> Women's Singles First Round :: Francesca Schiavone vs. Yanina Wickmayer
> Women's Singles First Round :: Alexandra Dulgheru vs. Angelique Kerber
> Women's Singles First Round :: Marina Erakovic vs. Simona Halep
Day 1
> Men's Singles First Round :: Novak Djokovic vs. Joao Souza
> Men's Singles First Round :: Milos Raonic vs. Tim Smyczek
> Men's Singles First Round :: Fernando Verdasco vs. Tommy Haas
> Men's Singles First Round :: Marco Cecchinato vs. Mardy Fish
> Men's Singles First Round :: Fabio Fognini vs. Steve Johnson
> Men's Singles First Round :: Borna Coric vs. Rafael Nadal
> Men's Singles First Round :: Kei Nishikori vs. Benoit Paire
> Men's Singles First Round :: Illya Marchenko vs. Gael Monfils
> Men's Singles First Round :: Marin Cilic vs. Guido Pella
> Men's Singles First Round :: Matthew Ebden vs. Grigor Dimitrov
> Men's Singles First Round :: Radu Albot vs. David Ferrer
> Women's Singles First Round :: Serena Williams vs. Vitalia Diatchenko
> Women's Singles First Round :: Kateryna Kozlova vs. Bethanie Mattek-Sands
> Women's Singles First Round :: Coco Vandeweghe vs. Sloane Stephens
> Women's Singles First Round :: Madison Keys vs. Klara Koukalova
> Women's Singles First Round :: Belinda Bencic vs. Sesil Karatantcheva
> Women's Singles First Round :: Monica Puig vs. Venus Williams
> Women's Singles First Round :: Anna Tatishvili vs. Karolina Pliskova
> Women's Singles First Round :: Lauren Davis vs. Heather Watson
> Women's Singles First Round :: Eugenie Bouchard vs. Alison Riske
> Women's Singles First Round :: Dominika Cibulkova vs. Ana Ivanovic