On December 9, 1981, Mardy Fish was born in Edina, Minnesota.
In 1984, at the age of two, Mardy Fish was featured on a Minneapolis TV station hitting tennis balls over the net.
Fish's family relocated to Vero Beach, Florida, in 1986.
Fish attended Boca Prep International School in Florida, where he played tennis and basketball with Andy Roddick. He also lived with Roddick's family during this time.
In 1999, Mardy Fish achieved a junior ranking of No. 14 in singles and No. 19 in doubles.
Mardy Fish turned professional in 2000 at the age of 18.
Fish's career saw significant improvement in 2003 as he won his first ATP singles title and reached the final of the Cincinnati Masters. Notably, he defeated former world No. 1 Carlos Moyà at the Australian Open in a thrilling five-set match.
In 2003, Mardy Fish reached the final of the Cincinnati Masters Series and won his first ATP singles title at the Stockholm Open, defeating Robin Söderling.
At the 2004 Summer Olympics in Athens, Fish won a silver medal in men's singles, defeating Juan Carlos Ferrero and Fernando González before losing to Nicolás Massú in the final.
In 2004, Fish reached the finals of the SAP Open and the Gerry Weber Open. His most significant achievement was winning the silver medal at the Summer Olympics in Athens, where he defeated notable players like Juan Carlos Ferrero and Fernando González before losing to Nicolás Massú in the final.
In 2004, Mardy Fish made his debut in World TeamTennis with the Hartford FoxForce. This marked the beginning of his nine-season participation in the league.
Fish's promising trajectory was hampered by a left wrist injury in 2005, requiring two surgeries and limiting him to only 17 matches that year.
In 2005, Mardy Fish joined the Houston Wranglers for his second season in World TeamTennis.
In 2006, Mardy Fish continued to play for the Houston Wranglers in World TeamTennis.
Fish started 2007 strong, reaching the quarterfinals of the Australian Open, his best result at a Grand Slam tournament. He notably defeated the fourth seed, Ivan Ljubičić, in the first round.
Mardy Fish achieved his best Grand Slam result in 2007 by reaching the quarterfinals of the Australian Open, where he lost to Andy Roddick.
Mardy Fish married Stacey Gardner, an attorney and former "Briefcase Model" on the game show "Deal or No Deal," in September 2008. The wedding was a Jewish ceremony, reflecting Gardner's faith. Fish's close friend and fellow tennis player, James Blake, served as a groomsman.
Fish reached the quarterfinals of the Delray Beach International Tennis Championships in 2008, where he lost to Robby Ginepri.
Fish, partnering with Serena Williams, won the Hopman Cup in 2008, an exhibition event in Perth, Australia.
Mardy Fish reached the quarterfinals of the US Open in 2008.
Fish had early exits in both the U.S. Men's Clay Court Championships and the Rome Masters in 2009.
Fish withdrew from the US Open in 2009 due to a rib injury.
In the 2009 BNP Paribas Open, Fish was eliminated in the singles second round but won the doubles title with Andy Roddick, his first ATP Masters Series 1000 title.
In 2010, Mardy Fish made significant changes to his physique and game. He lost over 30 pounds, going from 203 to 170, resulting in improved fitness, speed, and stamina on the court. This period also saw him focus on his forehand, leading to greater consistency in his shots.
Mardy Fish reached the final of the Cincinnati Masters Series for the second time in 2010.
The year 2010 saw Fish win the SAP Open in San Jose with Sam Querrey, defeat Andy Murray in straight sets at the Sony Ericsson Open, and engage in a controversial match with Murray at the Queen's tournament. Despite the controversy, Fish reached the final of the Queen's tournament, losing to Sam Querrey.
In April 2011, Fish became the top-ranked American tennis player, surpassing Andy Roddick.
On July 31, 2011, Mardy Fish reached the finals of the 2011 Farmers Classic, where he faced Ernests Gulbis. After defeating Ryan Harrison in the semifinals, Fish lost to Gulbis in the final with set scores of 7–5, 4–6, 4–6. He subsequently withdrew from Washington, D.C., due to a heel injury sustained during the final.
Fish reached his career-high singles ranking of world No. 7 in August 2011.
In August 2011, Mardy Fish reached his fourth Masters series final at the Rogers Cup. He defeated several top players, including Feliciano López and Stanislas Wawrinka, before facing Novak Djokovic in the final. Fish lost to Djokovic with set scores of 2–6, 6–3, 4–6, but rose to a career-high ranking of no. 7.
In 2011, Mardy Fish had a notable run in the Western & Southern Open, defeating Rafael Nadal for the first time and advancing to the semifinals. At the US Open, he made it to the fourth round before being eliminated by Jo-Wilfried Tsonga.
In 2011, Mardy Fish reached the quarterfinals of Wimbledon and the final of the Montreal Masters Series.
In 2011, Mardy Fish advanced to the quarterfinals of the Sony Ericsson Open by defeating notable players like Juan Martín del Potro. His performance allowed him to overtake Andy Roddick as the highest-ranked American player on the tour. He subsequently entered the semifinals of the Sony Ericsson Open, where he was defeated by Novak Djokovic. On April 18, 2011, Fish entered the top 10 rankings for the first time.
In 2011, Mardy Fish achieved his best result at the French Open by reaching the third round. He was defeated by Gilles Simon with set scores of 3–6, 4–6, 2–6.
Fish started 2011 with early exits at the Brisbane International and the Australian Open.
Fish reached the semifinals of the Delray Beach International Tennis Championships and the Regions Morgan Keegan Championships in 2011, losing to Juan Martín del Potro and Milos Raonic, respectively.
In 2012, Mardy Fish chose to compete at the Citi Open in Washington, D.C., instead of the Summer Olympics. He was the top seed and reached the semifinals of the tournament.
In 2012, Mardy Fish made a comeback at Wimbledon, where he was seeded 10th. His run was cut short in the fourth round when he lost to fifth seed Jo-Wilfried Tsonga in four sets.
In 2012, Mardy Fish played for the Sacramento Capitals in World TeamTennis.
In 2012, Mardy Fish reached the quarterfinals in Miami but was defeated by Juan Mónaco. After the match, he was hospitalized for severe cardiac arrhythmia. On May 23, he underwent a cardiac catheter ablation in Los Angeles to correct the condition. The arrhythmia caused significant mental and emotional difficulties for Fish, impacting his ability to sleep and be alone.
In 2012, Mardy Fish was defeated in the second round of the Australian Open by Alejandro Falla. He reached the third round at Indian Wells before losing to Matthew Ebden.
In the 2012 US Open, Mardy Fish, seeded 23rd, defeated Go Soeda, Nikolay Davydenko, and Gilles Simon. He withdrew before his fourth-round match with top seed Roger Federer due to health reasons, later revealing that anxiety was the cause.
Prior to his fourth-round match at the 2012 US Open, Mardy Fish withdrew from the tournament. This withdrawal, though not counted as a loss, marked a difficult moment in his tennis career.
In 2013, Mardy Fish continued to play for the Sacramento Capitals in World TeamTennis.
In 2013, Mardy Fish played doubles at the Washington, D.C. event, teaming with Radek Štěpánek. They made it to the final, but lost to Julien Benneteau and Nenad Zimonjić.
In 2013, Mardy Fish returned to the ATP tour at Indian Wells and Atlanta, but struggled with performance issues. After retiring in the third set against Jarkko Nieminen in Winston-Salem due to heat stroke, he announced he would not be playing in the US Open.
In June 2014, Mardy Fish underwent a second cardiac catheter ablation to correct misfiring electrical pulses in his heart. This procedure was part of his ongoing battle with cardiac arrhythmia.
In February 2015, Mardy Fish returned to competitive tennis at the Tennis Championship of Dallas, playing doubles with Mark Knowles. He also participated in the Indian Wells Masters but lost in the first round to Ryan Harrison.
In July 2015, Mardy Fish returned to the tour in Atlanta, where he lost in the first round of singles but won his first-round doubles match with Andy Roddick. In Cincinnati, he won his first singles match since 2013 against Victor Troicki but lost to Andy Murray in the second round.
In 2015, Mardy Fish disclosed that his withdrawal from the 2012 US Open was due to anxiety. This revelation highlighted the mental health challenges he faced during his career.
Mardy Fish retired from professional tennis after the 2015 US Open.
In 2016, Mardy Fish played for the Washington Kastles in World TeamTennis.
Mardy Fish emerged victorious at the Diamond Resorts Invitational in Orlando in 2016.
In 2017, Mardy Fish played for the New York Empire in World TeamTennis.
In 2018, Mardy Fish continued to play for the New York Empire in World TeamTennis.
Mardy Fish secured his second victory at the Diamond Resorts Invitational in Orlando in 2018.
Fish was appointed captain of the United States Davis Cup team in January 2019, succeeding Jim Courier.
In 2019, Mardy Fish continued to play for the New York Empire in World TeamTennis.
In 2020, it was announced that Mardy Fish would join the New York Empire for the 2020 World TeamTennis season, starting on July 12 at The Greenbrier.
Mardy Fish won the American Century Championship, a celebrity golf tournament held annually in Lake Tahoe, in 2020.
In 2021, the Netflix docuseries "Untold: Breaking Point" featured Mardy Fish sharing his personal experiences with anxiety and depression. This appearance offered insights into the challenges faced by athletes and helped destigmatize mental health issues.