Oh sure, get all technical if you like and point out that it was actually yesterday for a handful of teams. But baseball, being provincial (and that is a strength) takes little regard of that. Opening Day is when your team begins play, not someone else's.
So at 4:10 this afternoon, Monday, April 3, 2017, the Detroit Tigers will send Ian Kinsler to bat, and baseball will begin. We have a lineup which will do some damage. We have decent defense and good starting pitching. We will compete.
Yes, we. Because the local baseball team is our team. A good, solid summer awaits.