The Portland Thorns have set plenty of attendance records over their two-and-a-half National Women's Soccer League seasons.

They are the highest attended women's professional soccer club in the world by a large margin, outdraw their NWSL counterparts three- or four-fold on an average night, and have set the standard by which other sides aspire to be, called the "flagship team of the league" by U.S. Soccer President Sunil Gulati.

One thing they haven't had: a sell out at Providence Park. Until tonight.

How does 21,144 Thorns fans at a regular season Wednesday night NWSL game sound? Yup - good to me too. #makinghistory #soldout #baonpdx — Merritt Paulson (@MerrittPaulson) July 22, 2015

That will break the previous record of 19,123, set last season against Houston on August 3, a 1-0 win for the Thorns, by over 2,000 fans in attendance and well over their season average of 13,769.

While each team has seen significant bumps at the gate, highlighted by 13,025 seeing the Chicago Red Stars defeating the Dash 2-1 at BBVA Compass Stadium, the only other NWSL team playing all their matches in a MLS venue, though Chicago has played a match at Toyota Park and will play another in September and FC Kansas City opened their season at Sporting Park, while smaller venues have been filled beyond capacity since the end of the World Cup over two weeks ago.