German Alexander Zverev used his dominant serve to claim a fourth ATP title of the year with a commanding 6-4 and 6-4 win over South African Kevin Anderson at the Washington Open Tennis Tournament.

The 20-year-old fifth seed made only seven unforced errors and did not face a break point on the super-fast outdoor Hardcourt at Rock Creek Park.

One break in each set was enough for Zverev to enhance his burgeoning reputation as one of the game's rising talents.

He closed out the match in just under 70 minutes before accepting the enthusiastic applause from a near capacity crowd that included his parents.

Zverev joined Rafa Nadal as a four-time ATP winner this year. Only Roger Federer, with five, has captured more titles in 2017.

Zverev won his fifth career title and improved his career record against Anderson to 3-0.