Dropped catches, missed stumping, shoddy glovework and scores of 9, 0, 7 and 20 - Dinesh Karthik has been an all-round failure in the two Test matches against Sri Lanka. The question isn’t really why has he failed; it really is why he continues to get so many chances.In the first Test, Karthik dropped two catches. In the second, he missed another catch and muffed a stumping chance. Generally speaking, his collection has been extremely sub-par. His choice of shots too is far from sagacious. In the first Test, he struck a reverse sweep when India was five wickets down and 350 runs behind.