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Karachi: The Pakistan openers, in reply, began well, handling Murali and Mendis with relative ease for the most part but a momentary lapse in concentration towards the end by Butt cost him his wicket. Pakistan still need 401 more runs to avoid the follow-on - that's their first priority - and will bank on a captain's innings from Younis to get them to safety.
Sri Lanka's skipper Mahela Jayawardene and Thilan Samaraweera on Sunday broke the long-standing world record for the fourth wicket established by England's Colin Cowdrey and Peter May against West Indies in 1957.
Jayawardene 240 (424b, 32x4) and Samaraweera 231 (318b, 31x4) set a new record of 437 runs for the fourth wicket before being dismissed just before tea as Sri Lanka piled up declared on 644 for seven.
Mahela took a single off Shoaib Malik almost 30 minutes before tea on the second day of the first Test against Pakistan to take his partnership with Samaraweera pass 411.
It is now the highest fourth-wicket record in Test cricket surpassing the previous feat set by Cowdrey and May at Edgbaston. The Sri Lankan duo broke records like ninepins.
They also took Sri Lanka past the 600 mark which means its now the highest runs in an innings at the National Stadium in Karachi. The previous highest (599-7) was scored by Pakistan against India in 2006.
They also broke the highest partnership record for any wicket in Pakistan vs Srilanka. The previous record was established by the duo of Javed Miandad and Qasim Umar who put on 397 for the third wicket at Faisalabad in 1985.
They also broke the record for the highest partnership for any wicket at the National Stadium which 298 between Aamir Sohail and Ijaz Ahmed against the West Indies in 1998.
Brief Score: Pakistan 44/1 trail Sri Lanka 644/7 (Jayawardene 240, Samaraweera 231) by 600-runs
