Hi all, I searched but had difficulty finding a post related to this. Basically I was wondering how folks felt about trading with market orders on the open and near the close. (trading larger, liquid stocks). Is the market open and closing process fair, or is it gamed? (I'm talking about placing a market order prior to market open, and selling right at or near the close.) Essentially I'm working with a system that I've designed and tested to trade w/ market orders on the open, but wondering about caveats in practice. Any comments pro and con? If you had to choose for systematic trading, would you prefer to trade at open or close, and why? thanks. Appreciated.