Oh I am convinced that luck plays a large role in baseball, but I also feel that you can do alot to improve your chances at a lucky outcome.
Branch Rickey - "Luck is the residue of preparation meeting opportunity". As long as you get yourself in a chance to win, that is as much as you can ask for. At the end, if you win by 1 run or 14, it doesn't count more or less on the ledger sheet.
Pitchers throw the ball, after it leaves their hands, they have no control over where the ball goes. Batters hit the ball, after they hit the ball, they have no control over where it goes or if the play is made or not. You just do what you have control over and leave the rest to the BBGs I guess. And you'll win a far bit more games than you'll lose too.