The long-empty Saks Off 5th space on Rockville Pike is about to get a new tenant: Dick’s Sporting Goods, opening soon next to Lands’ End at Congressional Plaza. This will be the first dedicated sporting goods store to open on the Pike since Sports Authority went belly-up in 2016. Unlike the Dick’s at Rio in Gaithersburg, the Rockville location will have a warehouse format selling marked-down and clearance merchandise. This is a new initiative for Dick’s, which has thrived since the pandemic as shoppers spent big bucks on sports equipment and comfortable work-at-home clothing.