Filed under: Sporcle Friday: Mariners with the Most Grand Slams Four runs, one swing. By Luke Mounger@LukeMounger Oct 27, 2017, 8:00am PDT Share this story Share this on Facebook Share this on Twitter Share this on Reddit Share All sharing options Share All sharing options for: Sporcle Friday: Mariners with the Most Grand Slams Reddit Pocket Flipboard Email Photo by Victor Decolongon/Getty Images I was playing with my franchise in MLB The Show last night, and Bryce Harper The Mariner hit a grand slam off the Hit It Here Cafe. This got me thinking, which Mariners have hit the most grand slams? Let’s find out in the form of a quiz. LINK! More From Lookout Landing Everything that’s old is new again, Mariners lose home opener to Red Sox, 4-6 0-1: Chart Mariners Game #1 BOS vs SEA: Open Game Thread IV Mariners Game #1 BOS vs SEA: Open Game Thread III Mariners Game #1 BOS vs SEA: Open Game Thread II Mariners Game #1 Preview: 3/28/24, SEA vs. BOS