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Aussie odyssey over for Louk

Irishman Louk Sorensen showed his fighting spirit but ultimately saw his Australian Open fairytale ended by American John Isner today.

Sorensen -- ranked 287 in the world -- became the first Irishman to win a grand slam match in 25 years by beating Yen-Hsun Lu 6-4 3-6 6-2 6-1 in round one.

However, he faced a taller task in the second round against 6ft 9in American 33rd-seed Isner and was eventually ousted 6-3 7-6 (7-4) 7-5.

After battling his way through the qualifiers, the Ireland Davis Cup player maintained his startling progress by beating Lu yesterday to delight his countrymen back home.

With Sorensen having played mostly in Challenger and Futures events, the chief executive of Tennis Ireland yesterday hailed that achievement as "life-changing".

A win over Isner would have been momentous and the Stuttgart-based Sorensen -- where he plays for German third division club TC Doggenburg when he is not on the road -- put up a dogged fight against the American.

Despite losing the first set limply, he fought back hard in the second to force a tie-break in which Isner asserted his authority.

The third set was neck-and-neck throughout and Sorensen threatened to carry the fight even further despite failing to convert any of his three break points in the match.

However, Isner's power was proving too much for the Irishman to handle as the American -- who smashed down 21 aces in total -- finally took control to take victory in the third.

Elsewhere, defending champion Rafael Nadal secured a routine 6-2 6-2 6-2 win over Lukas Lacko to progress to the third round.

There were no signs of the early nerves the Spaniard suffered in his opening-round win over Australian Peter Luczak on Monday night as he this time raced into a 5-0 lead.

It was enough to overwhelm his 22-year-old Slovakian opponent, who was meeting a top-10 player for the first time in his career after winning his first match at a grand slam against Leonardo Mayer in the opening round.

Andy Roddick continued his clashes with Melbourne officials when he questioned an umpiring decision on match point in his victory over Brazil's Thomaz Bellucci.

The seventh seed had vented his fury at a line judge in his first round match, which forced him to tumble to the ground, and Roddick admonished the line judge at the time. Today, Roddick had a heated exchange with the umpire over a line call after his 6-3 6-4 6-4 win, risking the possibility of a fine for foul language.

"I don't do it for entertainment. I do it because I strongly believe what I feel," Roddick later explained. "I think if I believe in something strongly enough, I'm pretty outspoken about it."

Chile's Fernando Gonzalez, the 11th seed, saw off Turkey's Marsel Ilhan 6-3 6-4 7-5, but 21st seed Tomas Berdych crashed out 6-4 6-4 7-5 to Evgeny Korolev of Kazakhstan.

Reigning women's US Open champion Kim Clijsters prevailed in a tricky second-round match with veteran Tamarine Tanasugarn.

Clijsters won the match with the Thailand player 6-3 6-3 but she was far from comfortable against the heavy hitting of her 32-year-old opponent.

Dinara Safina overcame a minor stumble when serving for the match before she went through to the third round with a 6-3 6-4 win over Czech player Barbora Zahlavova Strycova.