Hobbled Nadal breezes past Lacko Despite sore knee, 10-time Grand Slam champ tops Lacko in straight sets updated 9:35 p.m. MELBOURNE, Australia - Rafael Nadal stayed on track for his second Australian Open title and his 11th Grand Slam championship when he beat Lukas Lacko 6-2, 6-4, 6-2 in a third-round match to start play Friday on Rod Laver Arena. Nadal, who strained his right knee last weekend while sitting down awkwardly at his hotel, again had the injured joint heavily wrapped but appeared not to be constrained during the match. The first rally, won by Nadal on Lacko's serve, lasted 28 hits, and the Spanish lefthander went on to break Lacko in the first game. Lacko was the remaining qualifier in the men's singles draw. Roger Federer, aiming for his fifth Australian title, played Ivo Karlovic in the following match on the same court.