Monumental Sports and Entertainment, the owner of the Wizards, Capitals, Mystics and Capital One Arena, has purchased its television partner NBC Sports Washington. Monumental Sports and Entertainment, the owner of the Wizards, Capitals, Mystics and Capital One Arena, has purchased its television partner NBC Sports Washington. Since the area’s Major League Baseball teams — the Nationals and Orioles — are carried by the Mid-Atlantic Sports Network, the majority of NBCSW’s programming already focused on Monumental’s teams. MSE already held a 33% stake in NBCSW and currently operates the streaming service Monumental Sports Network. In 2016, MSE signed a long-term partnership with the company, then known as CSN Mid-Atlantic, that covered…