The first-ever double night sessions are over at the U.S. Open, ending with Saturday night’s dueling card.

The first six days of the Open featured night cards at Arthur Ashe Stadium and the new Louis Armstrong Stadium, causing some confusion. Ticket holders for Armstrong Stadium’s night card were not allowed into Ashe Stadium.

In an attempt to drive up revenue after spending $150 million on a new second showcourt, a total of 6,600 lower-bowl seats were available for sale for Armstrong’s new night event. According to the USTA, an average of 4,600 tickets of the 6,600 were sold for the six Armstrong night cards. The USTA believes once word got out on the new arrangement, it caught on.

The last two Armstrong night sessions sold all of their 6,600 tickets. Fans with Ashe night tickets were allowed into Armstrong in the upper general admission seating. There will no longer be night cards at Armstrong for the rest of the tournament.

The Open’s night attendance saw a bump — an aggregate average total of 27,625. Last year’s average night attendance through the first six days was 23,927. The final Armstrong night card actually ended Sunday morning when Marin Cilic outlasted teenaged Aussie Alex de Minaur in Armstrong Stadium in a 5-set clash that ended at 2:21 a.m. — the fourth-latest Open finish ever.