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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.

<< Back to Challenge Summary Stats

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

Day 5
> Men's Singles Second Round :: Feliciano Lopez vs. Tatsuma Ito
> Men's Singles Second Round :: Gael Monfils vs. Alejandro Gonzalez
> Men's Singles Second Round :: Jerzy Janowicz vs. Kevin Anderson
> Men's Singles Second Round :: Grigor Dimitrov vs. Dudi Sela
> Women's Singles Third Round :: Roberta Vinci vs. Shuai Peng
> Women's Singles Third Round :: Johanna Larsson vs. Jelena Jankovic
> Women's Singles Third Round :: Sara Errani vs. Venus Williams
> Women's Singles Third Round :: Mirjana Lucic-Baroni vs. Simona Halep
Day 4
> Women's Doubles First Round :: Timea Babos/Kristina Mladenovic vs. Venus Williams/Serena Williams
> Men's Singles Second Round :: Simone Bolelli vs. Tommy Robredo
> Women's Singles Second Round :: Nicole Gibbs vs. Anastasia Pavlyuchenkova
> Women's Singles Second Round :: Aleksandra Krunic vs. Madison Keys
> Women's Singles Second Round :: Christina McHale vs. Victoria Azarenka
> Women's Singles Second Round :: Sorana Cirstea vs. Eugenie Bouchard
> Women's Singles Second Round :: Serena Williams vs. Vania King
> Women's Singles Second Round :: Samantha Stosur vs. Kaia Kanepi
> Women's Singles Second Round :: Catherine Bellis vs. Zarina Diyas
> Women's Singles Second Round :: Petra Kvitova vs. Petra Cetkovska
> Women's Singles Second Round :: Marina Erakovic vs. Elena Vesnina
> Women's Singles Second Round :: Karolina Pliskova vs. Ana Ivanovic
> Men's Singles Second Round :: Peter Gojowczyk vs. Milos Raonic
> Men's Singles Second Round :: Matthias Bachinger vs. Andy Murray
> Men's Singles Second Round :: Novak Djokovic vs. Paul-Henri Mathieu
> Men's Singles Second Round :: Jan-Lennard Struff vs. John Isner
> Men's Singles Second Round :: Sam Querrey vs. Guillermo Garcia-Lopez
> Men's Singles Second Round :: Kei Nishikori vs. Pablo Andujar
> Men's Singles Second Round :: Jo-Wilfried Tsonga vs. Aleksandr Nedovyesov
> Men's Singles Second Round :: Nick Kyrgios vs. Andreas Seppi
Day 3
> Men's Singles First Round :: Steve Johnson vs. Tatsuma Ito
> Men's Singles First Round :: Grigor Dimitrov vs. Ryan Harrison
> Men's Singles First Round :: Jerzy Janowicz vs. Dusan Lajovic
> Men's Singles First Round :: Tomas Berdych vs. Lleyton Hewitt
> Men's Singles First Round :: Kenny De Schepper vs. Ernests Gulbis
> Men's Singles First Round :: Feliciano Lopez vs. Ivan Dodig
> Men's Singles First Round :: Marin Cilic vs. Marcos Baghdatis
> Men's Singles First Round :: Pablo Cuevas vs. Kevin Anderson
> Men's Singles First Round :: Frank Dancevic vs. Joao Sousa
> Men's Doubles First Round :: Bob Bryan/Mike Bryan vs. Max Mirnyi/Mikhail Youzhny
> Women's Singles Second Round :: Shuai Peng vs. Agnieszka Radwanska
> Women's Singles Second Round :: Madison Brengle vs. Sabine Lisicki
> Women's Singles Second Round :: Tsvetana Pironkova vs. Jelena Jankovic
> Women's Singles Second Round :: Daniela Hantuchova vs. Alize Cornet
> Women's Singles Second Round :: Sara Errani vs. Anastasia Rodionova
> Women's Singles Second Round :: Sloane Stephens vs. Johanna Larsson
> Women's Singles Second Round :: Maria Sharapova vs. Alexandra Dulgheru
> Women's Singles Second Round :: Aliaksandra Sasnovich vs. Caroline Wozniacki
> Women's Singles Second Round :: Timea Bacsinszky vs. Venus Williams
> Women's Singles Second Round :: Jana Cepelova vs. Simona Halep
> Men's Singles Second Round :: Stan Wawrinka vs. Thomaz Bellucci
Day 2
> Women's Singles First Round :: Nicole Gibbs vs. Caroline Garcia
> Women's Singles First Round :: Grace Min vs. Ekaterina Makarova
> Women's Singles First Round :: Jarmila Gajdosova vs. Madison Keys
> Women's Singles First Round :: Misaki Doi vs. Victoria Azarenka
> Women's Singles First Round :: Serena Williams vs. Taylor Townsend
> Women's Singles First Round :: Samantha Stosur vs. Lauren Davis
> Women's Singles First Round :: Olga Govortsova vs. Eugenie Bouchard
> Men's Singles First Round :: Kei Nishikori vs. Wayne Odesnik
> Men's Singles First Round :: Gael Monfils vs. Jared Donaldson
> Men's Singles First Round :: Filip Krajinovic vs. Tim Smyczek
> Women's Singles First Round :: Petra Kvitova vs. Kristina Mladenovic
> Women's Singles First Round :: Flavia Pennetta vs. Julia Goerges
> Women's Singles First Round :: Svetlana Kuznetsova vs. Marina Erakovic
> Women's Singles First Round :: Alison Riske vs. Ana Ivanovic
> Men's Singles First Round :: Maximo Gonzalez vs. Sam Querrey
> Men's Singles First Round :: Marcos Giron vs. John Isner
> Men's Singles First Round :: Denis Istomin vs. Richard Gasquet
> Men's Singles First Round :: Bernard Tomic vs. Dustin Brown
> Men's Singles First Round :: Damir Dzumhur vs. David Ferrer
> Men's Singles First Round :: Marinko Matosevic vs. Roger Federer
> Men's Singles First Round :: Pablo Andujar vs. Jack Sock
Day 1
> Women's Singles First Round :: Sharon Fichman vs. Agnieszka Radwanska
> Women's Singles First Round :: Bojana Jovanovski vs. Jelena Jankovic
> Women's Singles First Round :: Julia Glushko vs. Madison Brengle
> Women's Singles First Round :: Amandine Hesse vs. Alize Cornet
> Women's Singles First Round :: Andrea Petkovic vs. Ons Jabeur
> Women's Singles First Round :: Angelique Kerber vs. Ksenia Pervak
> Women's Singles First Round :: Maria Sharapova vs. Maria Kirilenko
> Women's Singles First Round :: Sloane Stephens vs. Annika Beck
> Women's Singles First Round :: Magdalena Rybarikova vs. Caroline Wozniacki
> Women's Singles First Round :: Kimiko Date-Krumm vs. Venus Williams
> Women's Singles First Round :: Danielle Rose Collins vs. Simona Halep
> Men's Singles First Round :: Taro Daniel vs. Milos Raonic
> Men's Singles First Round :: Simone Bolelli vs. Vasek Pospisil
> Men's Singles First Round :: Robin Haase vs. Andy Murray
> Men's Singles First Round :: Jo-Wilfried Tsonga vs. Juan Monaco
> Men's Singles First Round :: Novak Djokovic vs. Diego Schwartzman
> Men's Singles First Round :: Michael Llodra vs. Daniel Gimeno-Traver
> Men's Singles First Round :: Mikhail Youzhny vs. Nick Kyrgios
> Men's Singles First Round :: Blaz Kavcic vs. Donald Young
> Men's Singles First Round :: Stan Wawrinka vs. Jiri Vesely
> Men's Singles First Round :: Edouard Roger-Vasselin vs. Tommy Robredo