Girls, Online dating messages?

I want to see what women like when it comes to online dating messages. There's times where I've messaged many girls to up my chances but I usually only got 3 replies/conversations. Messages (on POF) you can see the result, most of which were either read/deleted or read. What is something you ladies would think is acceptable? here's a sample message of what I'd usually send.

Mutual Interest: Baseball

Hey there! I played years of baseball growing up. Have you ever been to an MLB game?
Girls, Online dating messages?
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