Virendra Sehwag scored a defiant century to take India's score to 207 for 4 in reply to South Africa's mammoth first innings score of 558 on the third day of the first Test in Nagpur on Monday.However Sehwag was caught by JP Duminy on the delivery of Wayne Parnell at 109. Badrinath and Dhoni are on the crease.Earlier the pace duo of Dale Steyn and Morne Morkel dished out fiery spells to dismiss in-form opener Gautam Gambhir, Murali Vijay and ace batsman Sachin Tendulkar cheaply before Sehwag and Badrinath stabilised Indian innings.