Radek Štěpánek was the defending champion; however, he lost to Xavier Malisse in the first round.
Fernando Verdasco won in the final 3–6, 6–4, 6–4 against Andy Roddick.
Bobby Reynolds defended his title by defeating Michael McClune 6–1, 6–3 in the final.
Andrew Anderson and Fritz Wolmarans were the defending champions, but decided not to participate.
Ernests Gulbis was the defending champion, but chose not to participate.
Milos Raonic was the two-time defending champion and won the title for the third year in a row, defeating Tommy Haas in the final 6–4, 6–3.
Jürgen Melzer was the defending champion, but lost in the first round to Igor Sijsling.
Kei Nishikori won the title, defeating Feliciano López in the final, 6–2, 6–3.
Kevin Anderson was the defending champion, but lost to John Isner in the quarterfinals.
Novak Djokovic was the defending champion, but lost in the fourth round to Tommy Haas. This championship was the first since the tournament's inception that no American was featured in the quarterfinals, with the last player from the US, Sam Querrey, beaten in the fourth round by Tomas Berdych. This meant that it was also the first all-European final eight at the Miami Masters.
Alexandr Dolgopolov was the defending champion, but lost to Indian qualifier Somdev Devvarman in the second round.
Donald Young was the defending champion but chose to play in the Japan Open instead.
Peter Polansky was the defending champion, but withdrew because of an elbow injury.
Lleyton Hewitt was the defending champion, but chose to participate in the Davis Cup quarterfinals instead.
Rajeev Ram won the title, defeating Ivo Karlović in the final, 7–6(7–5), 5–7, 7–6(7–2).
Sam Querrey was the defending champion, but chose not to compete this year.
Sam Querrey was the defending champion, but chose to compete in the Japan Open instead of defending his title.
Kei Nishikori was the four-time defending champion, but chose to compete in Buenos Aires instead.
Sam Querrey was the defending champion, but lost in the quarterfinals to Juan Martín del Potro.
Jack Sock was the defending champion, but lost in the second round to Peter Gojowczyk.
This was the first edition of the tournament.
Jack Sock was the defending champion, but lost in the second round to Reilly Opelka.
Feliciano López was the defending champion, but lost in the quarterfinals to Nick Kyrgios.
Sam Querrey 
