The 2018 Miami Open presented by Itaú (also known as 2018 Miami Masters) was a professional men and women's tennis tournament played on outdoor hard courts. It was the 34th edition of the Miami Open, and part of the Masters 1000 category on the 2018 ATP World Tour, and of the Premier Mandatory category on the 2018 WTA Tour. All men and women's events took place at the Tennis Center at Crandon Park in Key Biscayne, Florida, United States, from March 19 through April 1, 2018. It was the last time the tournament was played at the Tennis Center at Crandon Park. The tournament moved to the Hard Rock Stadium starting in 2019.