KUALA LUMPUR, Aug 14: China flexed their muscles on the second day of the World Badminton Championships when third seed Chen Jin and sixth seed Chen Yu enjoyed comfortable victories on Tuesday.

With top seed Lin Dan yet to start his campaign to retain the title he won in Madrid last year, there were clear warnings for the pretenders about China's strength in depth which also includes the fourth seed Bao Chunlai.

Chen Jin needed just 22 minutes to breeze past unseeded Portuguese Marco Vasconcelos 21-9, 21-5. Chen Yu beat New Zealander John Moody 21-13, 21-11.

Lin, who had a first round bye, will be in action on Wednesday against Hong Kong's Wei Ng on a day when the week-long tournament moves sharply up the gears.

Olympic champion Taufik Hidayat of Indonesia plays India's Anup Sridhar and local favourites Lee Chong Wei and the exciting doubles pair of Koo Kien Keat and Tan Boon Heong also start their quest for Malaysia's first world crown.

Tuesday’s results (prefix number denotes seeding):

Men’s singles:

First round: Eric Pang (Netherlands) beat Sergey Ivlev (Russia) 21-15, 21-6; Richard Vaughan (Wales) beat Erwin

Kehlhoffner (France) 21-9, 22-20; Yan Kit Chan (Hong Kong) beat Jan Frohlich (Czech Republic) 21-15, 21-9; 9-Sony Dwi Kuncoro (Poland) beat Chetan Anand (India) 11-21, 21-14, 21-18; 11-Ronald Susilo (Singapore) beat Alistair Casey (Scotland) 22-20, 21-12; Roslin M.Hashim (Malaysia) beat Magnus Sahlberg (Sweden) 21-17, 21-9; 3-Chen Jin (China) beat Marco Vasconcelos (Portugal) 21-9, 21-5; 16-Simon Santoso (Indonesia) beat Ten Minh Nguyen (Vietnam) 20-22, 21-11, 21-19; Pablo Abian (Spain) beat Luka Petric (Slovenia) 21-9, 29-27; 5-Peter Gade (Denmark) beat Andrew Smith (England) 21-18, 21-10; Andrew Dabeka (Canada) beat Vladislav Druzchenko (Ukraine) 16-21, 21-18, 21-16; 14-Park Sung-hwan (South Korea) beat Jeff Tho (Australia) 21-14, 21-6; Bjorn Joppien (Germany) beat Raul Must (Estonia) 21-12, 21-11; 6-Chen Yu (China) beat John Moody (New Zealand) 21-13, 21-11; Yousuke Nakanisi (Japan) beat Christian Boesiger (Switzerland) 21-16, 14-21, 21-8.

Women’s singles:

First round: Ana Moura (Portugal) beat Yoana Martinez (Spain) 18-21, 21-11, 21-9; Ekaterina Ananina (Russia) beat Karen Foo Kune (Mauritius) 21-4, 21-9; 10-Mew Choo Wong (Malaysia) beat Simone Prutsch (Austria) 21-10, 21-9; Rachel Hindley (New Zealand) beat Ragna Ingolfsdottir (Iceland) 22-20, 21-17; Adriyanti Firdasari (Indonesia) beat Maja Tvrdy (Slovenia) 20-22, 21-12, 21-6; 11-Pui Yin Yip (Hong Kong) beat Trupti Murgunde (Indonesia) 21-17, 21-13; Anna Rice (Canada) beat Kati Tolmoff (Estonia) 21-14, 21-14; 5-Lin Zhu (China) beat Susan Hughes (Scotland) 21-7, 21-14; Eva Lee (U.S.) beat Martina Benesova (Czech Republic) 21-15, 21-14; Juliane Schenk (Germany) beat Kristina Ludikova (Czech Republic) 21-16, 21-10; Judith Meulendijks (Netherlands) beat Hwang Hye-youn (South Korea) 21-10, 21-12; 9-Petya Nedeltcheva (Bulgaria) beat Weny Rahmawati (France) 21-18, 21-8; 7-Lan Lu (China) beat Aiying Xing (Singapore) 21-9, 21-15; Larisa Griga (Ukraine) beat Eva Sladekova (Slovakia) 21-10, 21-5; 14-Kaori Mori (Japan) beat Jill Pittard (England) 21-13, 21-16.—Reuters