‘“Obviously it’s one of the proudest moments as a father that I’ve had, it was really emotional,’’ said Alexander, 36, who confirmed his intention to retire, only this wasn’t the time or place to detract from the team’s playoff week. “I was surprised, I didn’t know she was singing it, so it was a really cool experience. I thought she did a great job, just very confident, but if you know my daughter, that’s right up her alley.’’’