Anyone been to the tournament at Queen's before?

I've got tickets for the Thursday but something's come up near the tournament that day. I've got to visit a hospital around the corner in the morning for my new job and I'm hoping that play doesn't start on the day until about 11am, giving me time to get the hospital stuff out of the way and hotfoot it to the tennis afterwards.
Anyone been before and know what sort of time play starts? I'm guessing the earliest would be 11am, hopefully even midday.
