Former world No. 1 Andy Murray is the latest big name to exit from the Miami Open, which began Tuesday.

The 33-year-old Brit, a two-time winner in Miami (2009, 2013), withdrew on Tuesday with a left groin injury.

"I had no issues while training, felt fine, did some gym work Friday, no problem," Murray told the Miami Herald. "Then I woke up about 3 in the morning, felt pain in the groin, not on the side I had my surgery, and when I got out of bed I struggled quite a bit to walk. I have no idea what I did. It's one of those freak things. Each day it has gotten progressively better, but it's not enough. I have not practiced since Friday."