The third-seeded Moroccan, who was beaten by Andy Roddick in a dramatic quarter-final in Melbourne, lost his first-round match 7-5 6-3.

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The Argentine won 6-0 6-4 to reach the second round, with Briton Andy Murray a potential quarter-final opponent.

BBC: Del Potro eases through in Paris

Williams was sent to the canvas twice in the opening round on the way to a humiliating first fight, quarter-final, loss to Sheffield's Baker.

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This season's competition, which sees Premier League sides enter in the third-round stage on 2 January, will continue to be broadcast on ITV, who will show three live games from the third to fifth round - one additional game - and all games from the quarter-final stage onwards.

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Afterwards, Henman said he was satisfied with his display, coming after his quarter-final defeat by Jiri Novak at last week's Swiss Indoor tournament, and a second round defeat in his previous event in Madrid.

BBC: SPORT | Tennis | Henman safely past Srichaphan

Nigeria has never gone beyond the preliminary round at the Olympics, although they are the only African side to have reached the quarter-final of a World Cup.

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