A.B. De Villiers smashed the fastest Test century by a South African as the hosts tightened the noose around India by declaring innings at 620 for four on the third day of the first cricket Test at Centurion today. De Villiers took just 75 balls to notch up his 12th century as the Proteas virtually made a mockery of the Indian bowling attack. Hashim Amla 140 was dismissed by Ishamt Sharma. Harbhajan Singh claimed two wickets yesterday. India were all out for 136 in their first innings.