The 2009 Sony Ericsson Open (also known as 2009 Miami Masters) was a men's and women's tennis tournament held from March 23 to April 5, 2009.

The men's singles event was won by British player Andy Murray, who defeated Novak Djokovic in the final.

In the doubles events, Max Mirnyi and Andy Ram won the men's title by defeating the team of Ashley Fisher and Stephen Huss.

The women's doubles title was won by Svetlana Kuznetsova and Amélie Mauresmo who overcame Květa Peschke and Lisa Raymond in the final match.

The tournament consisted of both men's and women's singles and doubles events which were played on 12 Laykold Cushion Plus hard courts.

[5][6] 47 of the top 50 players in the ATP rankings entered the men's singles event at the tournament[7] with Rafael Nadal seeded first, followed by Roger Federer, Novak Djokovic and Andy Murray.

[13] In the women's singles field, defending champion Serena Williams was top seeded, with number two Dinara Safina only 311 points behind her in the WTA rankings at the start of the tournament.

Wildcards Marcos Baghdatis and Lleyton Hewitt were among the players progressing into the second round, while Germans Philipp Kohlschreiber and former World no.

Lucky loser Björn Phau was promoted into the third round after his opponent Albert Montañés suffered a hamstring injury during the second set of the match and was forced to withdraw.

[20][21] Frenchman Gaël Monfils took a hard-fought win over 22nd seed and former world number 1 Marat Safin in a third round match played for nearly three hours.

Czechs Tomáš Berdych and Radek Štěpánek overcame higher seeded players James Blake and Fernando González en route to the fourth round.

Novak Djokovic, Andy Murray, Juan Martín del Potro, Verdasco and Jo-Wilfried Tsonga made it into the quarterfinals.

[25][26][27] Del Potro defeated Nadal in the three-set quarterfinal match to reach the first ATP Masters semifinal of his career.

[24][40] Three times former champion and fifth seed Venus Williams faced stiff competition from Agnieszka Radwańska in fourth round.

[27][42] Williams sisters Serena and Venus set up the second semifinal after defeating Li Na and Iveta Benešová respectively.

Daniel Nestor and Nenad Zimonjić were the highest ranked team to lose, falling to Nicolás Almagro and David Ferrer, along with third seeds Mahesh Bhupathi and Mark Knowles, who lost to French duo Julien Benneteau and Jo-Wilfried Tsonga.

Ashley Fisher and Stephen Huss, Knowle and Melzer and Max Mirnyi and Andy Ram were the other teams who made it into the semifinals.

The Bryan brothers faced Fisher and Huss in the first semifinal and lost, ending their streak of winning 13 consecutive matches.

Daniela Hantuchová and Ai Sugiyama, who lost to wildcard entrants Petra Martić and CoCo Vandeweghe, were the only seeded pair to drop out in the first round.

[18] Another wildcard team of Svetlana Kuznetsova and Amélie Mauresmo defeated the top seeds Cara Black and Liezel Huber in the second round.

Eighth seeds Maria Kirilenko and Flavia Pennetta were also eliminated in second round, losing to Chuang Chia-jung and Sania Mirza.

[50] Chuang and Mirza continued their march into the semifinal defeating second seeds Anabel Medina Garrigues and Virginia Ruano Pascual.

They were joined by Kuznetsova and Mauresmo, Anna-Lena Grönefeld and Patty Schnyder, and Květa Peschke and Lisa Raymond, the only seeded team left in the draw.