Mike was drafted by the Orioles in the third round of the 2011 draft out of East Carolina University, and Bowman was cool enough to mess up his first, and one of the only current, cards of him by somehow photoshopping him into a Nationals uniform. I remember when Mike signed this card for me during his time as a Frederick Key in 2012, and I asked him how he felt about being pictured with the wrong team. At this point, I forget what he said but he seemed to take it and stride and didn't react too strongly.
I can also tell by the Old Man Card that Mike signed and personalized for me that I found that photo a few years back. I'm pretty confident it was taken on a back field during Spring Training (probably 2012 or '13) and at that point was one of the only shots of him in an Orioles uniform. Looking at the picture now, you can barely tell that it's him, but trust me that it is!
On one of my family's spring training trips, we happened to stay at the same hotel as some of the O's smaller name players and minor leaguers who were in big league camp and Mike was one of those players. I don't remember specifically interacting with him around the hotel, but you could pretty obviously tell that he was a player by his size (he's 6' 6", 215).
And I would be remiss not to mention that I read an account by how Mike preps for his games by reading a book in the stands prior to his starts. The book he was reading on Sunday was one of the Harry Potter books, which my wife and I both enjoy, so it makes him even easier to root for!
Good luck Mike! I hope you have many more starts for the Orioles like the one on Sunday. But even if you don't, no one can ever take away the fact that you are the 993rd player to appear in a game for the O's!