After showing relative strength in the first quarter, the energy sector and the Energy Select Sector SPDR Fund ETF NYSEARCA: XLE trended lower in the second quarter, recouping most of their gains. Now up just over 5% year-to-date, the sector is underperforming the market and its benchmark. However, the XLE ETF's recent dip to its 200-day SMA presents a potential buying opportunity. Three stocks that show promise for investors looking to gain exposure to the sector are Williams Companies, Occidental Petroleu ...