Veteran Indian off-spinner Harbhajan Singh is set to complete a century of Test appearances. The 32-year old will become only the 10th Indian to have achieved the feat when he takes the field in the first of the four Test matches against Australia at the M.A. Chidambaram Stadium in Chennai tomorrow.With 408 wickets from 99 Tests, Harbhajan has been one of India's most prolific bowlers even though he has been enduring a tough phase for some time.