Citi Open

On a dreary, unseasonably cold April afternoon at the Rock Creek Park Tennis in Northwest, Mark Ein announced that he’s adding the management of the historic Citi Open to his eclectic portfolio of local investments.

Serial investor and entrepreneur Mark Ein is making another splash, taking over the managerial responsibilities of the Citi Open, the region's premier annual pro tennis tournament.

Mark Ein can’t do anything about the rain that often bedevils Washington’s Citi Open. He can’t change the tournament’s date, either, despite August’s withering heat and humidity — nor should he. It occupies a prime spot on the global…

With the goal of safeguarding its future in Washington, the Citi Open, which has brought top tennis pros to the D.C. region for a half-century, is in the late stages of negotiations to transfer management of the tournament to…