Despite an impressive performance to win the U.S. Men's Hardcourt Tennis Championships, two-time Wimbledon champion Boris Becker said he must improve to take his first U.S. Open title.

Top-seeded Becker defeated John McEnroe 6-4, 6-2 Sunday for the $50,000 first prize at the Indianapolis Sports Center. This year's Wimbledon runnerup ensured his place as a favorite in the Open, which begins later this month."I will have to play a little bit better and serve better," Becker said. "I must also improve condition-wise. When you play the best of five sets, you're out there for four hours. I will work a lot on running and getting into shape."

Becker, who beat McEnroe for the third time in four meetings, earned the 16th singles crown of his professional career and his fourth title of 1988. The blond West German's other triumphs this year came at Indian Wells, Dallas and the Queen's tournament in London.

McEnroe played aggressively, showing flashes of the form that made him a three-time Wimbledon champion and four-time U.S. Open winner. It was McEnroe's first finals appearance since defeating this year's Wimbledon champion, Stefan Edberg, in April at Tokyo in his only prior hard court appearance of 1988.

McEnroe, trying to return after a self-imposed layoff from the game, said it may be next year before his play returns to the level he desires. That frustrates him as the Open approaches.