McEnroe is a four-time champion at the Albert Hall event

John McEnroe plans to play at London's Royal Albert Hall for at least one more year despite Friday's quarter-final defeat by Paul Haarhuis.

Haarhuis won 6-2 6-3 to reach the BlackRock Masters Tennis semi-finals.

Asked if it was his final appearance at the event, McEnroe, 48, said: "Could be. I'm not getting any younger."

But he later said: "I'm definitely not going to say that I won't be here next year because I think I can at least play one more and then we'll see."

The American, who has won the Albert Hall tournament four times, added: "I'm going to pick and choose my events next year.

"If I can get the balance right between rest in-between events, staying in shape and playing, I think I can still beat anyone out there.

"It's definitely not getting any easier, but that's the challenge. That's what keeps it interesting."

Haarhuis goes on to face Sergi Bruguera, who defeated Jeremy Bates 6-3 6-4.

In Friday's other quarter-finals, Guy Forget upset Greg Rusedski 2-6 7-5 13-11 and Cedric Pioline beat Wayne Ferreira 6-3 6-4.