Buy low, sell high is a maxim of investing, and a good time to buy low is when a stock has just fallen sharply. That's why it's smart to track the worst-performing stocks on the market. Sometimes, you can find a deal. 

September was an ugly month for the stock market as the S&P 500 fell 9.3%, but the two worst-performing stocks, FedEx (NYSE: FDX) and VF Corp (NYSE: VFC), fell nearly 30%, dropping 29.6% and 27.8%, respectively. Is the sell-off a buying opportunity or a red flag?

Let's take a look at why these stocks were the worst in the broad-market index and where they stand today.

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Source Fool.com