Phillip Hughes powered to his second century of the match as Australia extended its lead over South Africa to 506 at the close on the third day of the second Test at Kingsmead on Sunday. Hughes advanced to 136 not out as Australia surged to 292 for three in its second innings. The opener, who hit his maiden Test ton in the first innings, became the youngest player to score a century in each innings of a Test at 20 years and 98 days old. West Indian George Headley was the former record-holder with 114 and 112 against England in Georgetown in 1930 aged 20 years and 297 days old. The left-handed Hughes and captain Ricky Ponting added 164 in just over three hours for the second wicket as Australia piled on the misery for the South African bowlers. Ponting fell for 81 when he sent a pull off Morne Morkel to Neil McKenzie at deep midwicket and Michael Hussey (19) followed him back nearly an hour later when he edged a delivery from off-spinner J.P. Duminy that turned away from him and Jacques Kallis took smart catch at slip. Hughes continued to stamp his dominance on the bowlers, however, going to his century in 277 minutes off 247 deliveries. The post-lunch session was dominated by Ponting as he became the second-highest Australian run-scorer when he reached 61 and 10,928 career runs to overtake his predecessor as captain, Steve Waugh. Alan Border is the top run-scorer with 11,174. The visitors needed just three balls to wrap up South Africa's first innings for 138, but captain Ponting chose not to enforce the follow on. Tours could resume: PCB Pakistan Cricket Board chairman Ejaz Butt said on Sunday his country could host an international team in the next six to nine months and will still co-host the 2011 World Cup. Butt was speaking by telephone on BBC's Five Live Sportsweek program about the militant attack on the Sri Lanka team bus in Lahore on Tuesday in which seven people were killed and six members of the Sri Lankan team injured. “I would expect teams will tour here again as soon as possible. I would give it six to nine months to get things organized,” he said. “I would want us to get security to a level that would be a guarantee from my government that no such incident like this could happen again, or I will not invite anybody,” the PCB chief added.