Gulbis played golf Tuesday with Roethlisberger at Laurel Valley Golf Club in Ligonier, a former site of the Ryder Cup and PGA Championship. On Wednesday, she visited Oakmont Country Club, where the U.S. Women's Open will be played July 8-11.
Gulbis and Roethlisberger were linked romantically several years ago, but the relationship did not last.
Roethlisberger was suspended by the NFL for six games after being accused of sexually assaulting a Georgia college student in March. He was not charged in the case, but was punished under the NFL's personal conduct policy.
Gulbis says she'll continue to cheer for Roethlisberger and the Steelers.