In Todd Gallagher’s book “Andy Roddick Beat Me With A Frying Pan”, Mike Cameron reveals that he has played Major League Baseball while intoxicated with alcohol.

It’s not as common as greenies, but big leaguers have been known to step on the field liquored up. … Almost every current major leaguer I spoke to knew of players who had stepped on the field under the influence.  

When asked what the signs were, the players typically responded the way Giant Ryan Klesko and Padre Jake Peavy did: ‘I just knew.’ Interestingly, another Padre, center fielder Mike Cameron, had a more intimate experience with game-day tipsiness:

“Sh-t, I’ve played drunk.” When? “New York City.” What were the circumstances “I went four for four with two jacks and eight ribbies. I’m not saying that’s the only day I played drunk, but that was the best one.”  

AOL Fanhouse does the math and figures out the exact day when Cameron played drunk, using the statistics he cited. Cameron only had one game with right RBI, which was an afternoon game on August 19, 2001 against the New York Yankees while he was a Seattle Mariner.