You probably have figured it out by now, but I had the same problem on Go90.com. I went to the NWSL site and clicked on the game in the scoreboard along the top of the front page. After running a lot of scripts, the video downloaded and when I hit play, got the whole game.
The recent numbers are trending up: NWSL Viewership on Lifetime for every week. pic.twitter.com/RwBWFD5Ihg— Nikita (@kryptobanana) July 18, 2017 (The 49,000 on July 1 overlapped with the USMNT-Ghana's match.)
It was also the Saturday before the 4th of July. Since the 4th occurred on a Tuesday this year, a lot of people celebrated it on that day/evening.