Caroline Wozniacki says members of her family were threatened in the crowd at the Miami Open on Friday night.
Wozniacki, from Denmark, detailed the encounters in a tweet, saying unruly crowd members "wished death" upon her mother and father and told her fiancee's nephew and niece, both 10 years old, to "shut the (expletive) up."
"Last night I lost a tough match to a great opponent and friend Monica Puig at the Miami Open. I am fully aware that tennis is a game of wins and losses. However, during the match last night, people in the crowd threatened my family, wished death upon my mom and dad, called me names that I can't repeat here and told my fiance's niece and nephew (who are only 10 years old) to sit down and shut the (expletive) up, meanwhile security and staff did nothing to prevent this and even accepted this to take place. While I always encourage fans to cheer for their favorite player, and I thrive on a challenging atmosphere, when certain lines are crossed, it makes tennis miserable for both competitors," her message began.
"I hope the Miami Open chooses to take this seriously because it's a horrible example to set for the next generation of tennis players and fans. I wish Monica all the best for the rest of the tournament."
Caroline Wozniacki throughout her career
Caroline Wozniacki throughout her career
Caroline Wozniacki of Denmark hits a return against Anastasia Pavlyuchenkova of Russia during the girl's singles final at the Australian Open tennis tournament in Melbourne January 29, 2006. REUTERS/Darren Whiteside
Denmark's Caroline Wozniacki kisses her trophy after defeating Slovakia's Magdalena Rybarikova during their girls' final match at the Wimbledon tennis championships in London July 8, 2006. REUTERS/Alessia Pierdomenico (BRITAIN)
Denmark's Caroline Wozniacki hits a shot to Ukraine's Alona Bondarenko at the Australian Open tennis tournament in Melbourne January 17, 2008. REUTERS/Vivek Prakash (AUSTRALIA)
Denmark's Caroline Wozniacki reacts during her match against Australia's Jelena Dokic at the Australian Open tennis tournament in Melbourne January 23, 2009. REUTERS/Oliver Weiken/Pool (AUSTRALIA)
Denmark's Caroline Wozniacki returns the ball to France's Amelie Mauresmo during their semi-final match at the Madrid Open tennis tournament May 16, 2009. REUTERS/Francisco Seco (SPAIN SPORT TENNIS IMAGES OF THE DAY)
Sabine Lisicki of Germany holds the trophy after winning her women's tennis match against Caroline Wozniacki of Denmark at the Family Circle Cup Tennis Tournament final match in Charleston, South Carolina, April 19, 2009. REUTERS/Tami Chappell (UNITED STATES SPORT TENNIS)
Caroline Wozniacki of Denmark celebrates defeating Melanie Oudin of the United States during their quarter-final match at the U.S. Open tennis championship in New York, September 9, 2009. REUTERS/Jeff Zelevansky (UNITED STATES SPORT TENNIS)
Caroline Wozniacki of Denmark reacts after suffering from cramp during her WTA Tour Championships tennis match against Vera Zvonareva of Russia in Doha October 29, 2009. Wozniacki went on to win the match. REUTERS/Fadi Al-Assaad (QATAR SPORT TENNIS)
Caroline Wozniacki of Denmark holds the trophy after achieving the number one world ranking following the WTA Championships in Doha October 29, 2010. REUTERS/Stringer (QATAR - Tags: SPORT TENNIS IMAGES OF THE DAY)
Caroline Wozniacki of Denmark returns the ball to Marion Bartoli of France during their semi-final match at the Qatar Open tennis tournament in Doha February 25, 2011. REUTERS/Fadi Al-Assaad (QATAR - Tags: SPORT TENNIS)
Caroline Wozniacki of Denmark holds her trophy after winning against Peng Shuai of China in their final match of the WTA Brussels Open tennis tournament in Brussels May 21, 2011. REUTERS/Francois Lenoir (BELGIUM - Tags: SPORT TENNIS)
Caroline Wozniacki of Denmark hits a return to Agnieszka Radwanska of Poland during their match at the Sydney International tennis tournament January 11, 2012. REUTERS/Daniel Munoz (AUSTRALIA - Tags: SPORT TENNIS)
Caroline Wozniacki of Denmark rests during a break in play against Kim Clijsters of Belgium during their women's singles quarter-finals match at the Australian Open tennis tournament in Melbourne January 24, 2012. REUTERS/Toby Melville (AUSTRALIA - Tags: SPORT TENNIS)
Denmark's Caroline Wozniacki hits a shot during her third round women's singles match against Germany's Angelique Kerber at the China Open tennis tournament in Beijing October 4, 2012. REUTERS/David Gray (CHINA - Tags: SPORT TENNIS)
Sep 2, 2014; New York, NY, USA; Caroline Wozniacki (DEN) hits to Sara Errani (ITA) on day nine of the 2014 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center. Mandatory Credit: Robert Deutsch-USA TODAY Sports
Serena Williams of the U.S. (R) talks with Caroline Wozniacki of Denmark after defeating her in their women's singles finals match at the 2014 U.S. Open tennis tournament in New York, September 7, 2014. REUTERS/Ray Stubblebine (UNITED STATES - Tags: SPORT TENNIS)
Caroline Wozniacki of Denmark holds her runner up trophy and shares a laugh with Serena Williams of the U.S. after Williams won their women's singles finals match at the 2014 U.S. Open tennis tournament in New York, September 7, 2014. REUTERS/Eduardo Munoz (UNITED STATES - Tags: SPORT TENNIS)
Julia Goerges of Germany plays a shot to Caroline Wozniacki of Denmark during their women's singles match at the French Open tennis tournament at the Roland Garros stadium in Paris, France, May 28, 2015. REUTERS/Vincent Kessler TPX IMAGES OF THE DAY
Tennis - Pan Pacific Open Women's Singles Final match - Ariake Coliseum, Tokyo, Japan - 25/09/16. Caroline Wozniacki of Denmark holds the winning plate during an awarding ceremony after winning the final match against Naomi Osaka of Japan. REUTERS/Issei Kato
Tennis - French Open - Roland Garros, Paris, France - June 4, 2017 Denmark's Caroline Wozniacki in action during her fourth round match against Russia's Svetlana Kuznetsova Reuters / Gonzalo Fuentes TPX IMAGES OF THE DAY
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Her fiancee, retired NBA player David Lee, backed up her account in a tweet.
"Disgusting atmosphere, hope something can be done to prevent this from happening again!," Lee wrote.
Puig, who lives in Miami and hails from Puerto Rico, recovered from a sluggish start to beat Wozniacki 0-6, 6-4, 6-4 in the round of 64.