Citi analyst Christian Wetherbee believes the "lull" in FedEx shares presents a buying opportunity ahead of June. The analyst, however, lowered his Q3 earnings per share estimate to $3.10 from $3.30 to reflect "some challenging" January weather. FedEx will provide two positive messages in June, Wetherbee tells investors in a research note. The first being Ground capex declining and the second will be above consensus fiscal 2019 guidance, the analyst contends. He sees "material upside potential" in FedEx shares and keeps a Buy rating on the name with a $304 price target.