Here is the ETF Professor's ETF Watch List for Tuesday, April 9, 2013. Keep an eye on the PowerShares DB Base Metals Fund DBB. Give the First Trust ISE-Revere Natural Gas Index Fund FCG a look. The Vanguard Growth ETF VUG is worth a trade. Emerging markets plays of the day: iShares MSCI Emerging Markets Index Fund EEM, iShares MSCI Taiwan Index Fund EWT and the iShares MSCI Mexico Investable Market Index Fund EWW. Forex play of the day: CurrencyShares Australian Dollar Trust FXA. Bond play of the day: WisdomTree Emerging Markets Local Debt ETF ELD.