Goffin won their only previous meeting. That was in August 2013 on a hard court. Sock retired in the third set.
Sock made the third round in Madrid after losing to Monaco in the Houston Final. He beat Del Potro although I think the Argentinian was drained after his win over Thiem. He played well to come back against Pella in the first round this week.
Goffin has had a lot of close matches recently. He lost in a third set tie break last week to Pouille. He lost in 3 sets to Zverev in Munich. Five of his last 6 went to a deciding set.
The value on Sock today. The match can go either way.