A battle in Gob - In the parallel passage (marginal reference), “Gezer” is named as the field of this battle. However, Gath is named 2 Samuel 21:20, 2 Samuel 21:22 in a way to make it probable that Gath was the scene of all the battles. The Septuagint in this verse has “Gath.”
Related Commentaries of 2 Samuel 21:18
2 Samuel 21:18
18 And it came to pass after this, that there was again a battle with the Philistines at Gob: then Sibbechai the Hushathite slew Saph, which was of the sons of the giant.f