Lenovo Group strengthened its lead as Asia's top personal computer supplier in the second quarter this year, seizing a 20 per cent market share to outpace its largest competitors in the region. The world's No. 4 personal computer brand shipped about 5.4 million units, up 45 per cent year on year, during the second quarter, according to preliminary estimates for the Asia-Pacific, excluding Japan, by research firm International Data Corp (IDC). Total shipments in the region grew 36 per cent year on year to reach 27 million units, as sales of desktop computers helped offset the lower-than-expected demand for laptop computers. Bryan Ma, IDC's associate vice-president for Asia-Pacific devices and peripherals research, said Lenovo continued to lead the region in the second quarter due largely to the strong performance of its core mainland market. That enabled the Beijing-based computer maker to bolster its market share to 20.3 per cent, from 18.8 per cent in the first quarter and 18.9 per cent a year ago. 'We have the right strategy in place and we're effectively executing it,' chief executive Yang Yuanqing said in May. By comparison, Lenovo's closest rivals - Hewlett-Packard, Dell, Acer and AsusTek Computer - all lost market share in Asia last quarter. HP, the world's largest supplier of personal computers and No 2 brand in Asia, saw its shipments in the region decline 3 per cent year on year to about 3.1 million units, affected by news that it sold faulty laptop computers and ignored consumer protection regulations on the mainland. In March, the country's General Administration of Quality Supervision, Inspection and Quarantine found that several different HP laptop models had defective video cards and displays after responding to consumers' complaints of overheating, system crashes and black screens on certain HP Pavilion and Compaq Presario laptops. The United States firm, which acknowledged the findings and pledged to improve, saw its Asia market share decline to 11.6 per cent from 14.1 per cent in the first quarter and 16.2 per cent a year ago.