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 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 Mariners Moose Tracks, 6/7/23: Elly De La Cruz, Jacob deGrom, and Alek Manoah Mariners hitters show more discipline, Teo and Julio punish some baseballs, win 4-1 over Padres 30-30: Chart Mariners Game #60 Preview, 5/6/23: SEA at SDP Dueling Disappointments: Mariners at Padres Series Preview Mariners Moose Tracks, 6/6/23: Jacob deGrom, Brandon Lowe, and Andrew McCutchen