"He's spent so many years fighting B-level opponents, he's become a B-level champion, " said Haye.

BBC: Haye targets 'B-level' Klitschko

In Monday's second match in Group B, defending champion Novak Djokovic saw off a determined challenge from Russian Nikolay Davydenko to register a three sets victory.

CNN: Swede Soderling brushes aside Nadal

Meanwhile, Ferrer's victory ensured he joins defending champion Roger Federer -- who has qualified from Group B -- in the last four of the competition.

CNN: Ferrer stuns Djokovic in straight sets

McCann, who claimed a bronze medal in the World B Championship road race in Switzerland during the summer, finished 52 seconds ahead of Irish time trial champion David O'Loughlin in the 40K event.

BBC: SPORT | Other Sport | Cycling | McCann guarantees world place