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Shahar Peer

Legg Mason Tennis Classic now the Citi Open

The Legg Mason Tennis Classic, a staple of the late-summer sporting scene in the Washington area for more than four decades, is getting a dramatic makeover that will include a new title sponsor, stadium upgrades and shared billing with an existing tournament for rising women's players.

The key development driving the changes is a new title sponsor in Citigroup, which will replace Baltimore-based Legg Mason after an 18-year association with the hard-court classic.

To be known as the Citi Open, the tournament will remain at Washington's William H.G. FitzGerald Tennis Center in Rock Creek Park. But the venue will be expanded to include a new 2,500-seat show court and five new...