Red Robin Gourmet Burgers, Inc. RRGB has reported preliminary comparable restaurant sales for the six weeks ended Sep 6, 2020.Preliminary Comparable SalesRed Robin has been witnessing sequential improvement in sales through the six weeks ended Sep 6, 2020.For the weeks ended Aug 2, Aug 9, Aug 16, Aug 23, Aug 30 and Sep 6, comparable restaurant revenues fell 35.4%, 32.9%, 30.6%, 26.1%, 22.1% and 21.9%, respectively.Meanwhile, 85% (or 349 dining rooms) company-operated restaurants have been reopened as of Sep 6, 2020.Notably, the company has been witnessing improvement in comparable sales on the back of expanded seating capacity, primarily through outdoor dining. Also, strong off-premise sales through carryout and third-party delivery are adding to the positives.Nonetheless, the company intends to maintain the momentum by implementing seating expansion in all-weather tents and booth partitions by early fourth-quarter fiscal 2020. Also, indoor dining re-openings in California are likely to benefit the company going forward.So far this year, shares of Red Robin have plummeted 63.3% against the industry’s 3.9% growth.Other UpdatesAs on Sep 6, 2020, the company reported liquidity of approximately $104 million, inclusive of cash and borrowing capacity.Zacks Rank & Key PicksRed Robin currently carries a Zacks Rank #3 (Hold). You can see the complete list of today’s Zacks #1 Rank (Strong Buy) stocks here.Some better-ranked stocks in the same space include Brinker International, Inc. EAT, Darden Restaurants, Inc. DRI and Dave & Buster's Entertainment, Inc. PLAY. Brinker sports a Zacks Rank #1, while Darden and Dave & Buster's carry a Zacks Rank #2 (Buy).Brinker has a three-five year earnings per share growth rate of 11.4%.Darden has a trailing four-quarter earnings surprise of 8.1%, on average.Dave & Buster's fiscal 2022 earnings are expected to surge 108.3%.5 Stocks Set to DoubleEach was hand-picked by a Zacks expert as the #1 favorite stock to gain +100% or more in 2020. Each comes from a different sector and has unique qualities and catalysts that could fuel exceptional growth.Most of the stocks in this report are flying under Wall Street radar, which provides a great opportunity to get in on the ground floor.Today, See These 5 Potential Home Runs >>Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Darden Restaurants, Inc. (DRI): Free Stock Analysis Report Brinker International, Inc. (EAT): Free Stock Analysis Report Red Robin Gourmet Burgers, Inc. (RRGB): Free Stock Analysis Report Dave Busters Entertainment, Inc. (PLAY): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research