Atletico Madrid and Real Madrid - who sit second and third respectively - face each other in the capital city derby on Saturday, meaning that victory for Barca would see them extend their advantage over at least one of those teams.
Luis Suarez could not get on the scoresheet in that match, but here Sports Mole looks at his past record against Athletic.
Suarez won all of his first five league games against Sunday's opponents, but that run came to an end in the reverse fixture when Barca were held to a 1-1 draw at Camp Nou.
The Uruguayan's goals in this fixture have also dried up, having scored five in his first three league meetings only to draw blanks in each of the last three.
Suarez enjoyed a particularly fruitful day against Athletic in January 2016, when he helped himself to a hat-trick and two assists as Barcelona recorded a 6-0 win at Camp Nou.
Even allowing for his recent drought in this fixture, the 32-year-old has still directly contributed to 11 goals in 12 meetings with Athletic and has never been on the losing side against them in La Liga.