Wait a minute! 18.80 is not a low ball order! 2 cents below? Here's my 2 cents!
jugs is right questioning trying to squeeze blood out of a turnip, but in this case it could easily blow past your bid on the downward side. Head fakes are common at open, too. IMO you should watch the market for at least 15 minutes and decide if the water is the right temp to dip your toe, or do a cannonball, lol. But then depending on your patience, (or if you are a patient), slap the ask or bid. I use RSI to help predict when the price is relatively cheap at any moment. It can go either way but use the tools you are given.
Good Luck!
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